Grade 7 · English for Korean learners
A body is a crowded place. Tubes, pumps, sheets of tissue, and electrical signals somehow share the same limited space without an appointment system. Dissection means carefully separating structures to study how they are arranged. It can reveal information that a flat picture hides, but it also changes the thing being examined. The work requires observation, respect, and a clear reason for using a specimen. Understanding anatomy is useful in medicine and biology. Understanding the limits of a specimen is equally useful, especially when an apparently obvious structure refuses to match the textbook.
In the News
New discoveries are showing how human anatomy is far from settled — The Conversation, 27 March 2026. Anatomy still contains unresolved questions. Textbook diagrams cannot show every variation.
The restricted source list did not yield three verified relevant reports published within the past three years.
What do you think?
1] Why is an object easier to understand after opening it?
2] When can opening something destroy useful information?
3] Why are soft objects harder to measure?
4] How could you describe a hidden space?
5] Why does a diagram sometimes differ from a real object?
6] What could a thick wall suggest about its job?
7] How can a folded surface fit into a small space?
8] Why should tools have different shapes?
9] How could two people examine the same object differently?
10] Why does recording the starting position matter?
11] What makes a model convincing?
12] Why should a gift be treated respectfully?
13] How could a transparent model help learning?
14] What might a damaged object fail to show?
15] Why are gloves not a substitute for care?
16] How would you explain what you saw without guessing?
17] Why can a colour change after treatment?
18] When is a photograph better than a drawing?
19] What should happen when someone dislikes an activity?
20] How can you learn about a structure without opening it?
Did You Know?
1] Andreas Vesalius published his influential anatomy book in 1543.
2] An earthworm has no bones, but its muscles work against a fluid-supported body.
3] The stomach’s protective mucus helps prevent its acidic contents from damaging the living lining.
4] A preserved specimen cannot show normal blood flow or breathing, however carefully it is examined.
Vocabulary
- structure — 구조
- function — 기능
- specimen — 관찰용 표본
- observe — 관찰하다
- separate — 분리하다
- surface — 표면
- layer — 층
- lining — 안쪽 막
- wall — 벽
- chamber — 방
- valve — 판막
- branch — 갈라지다
- fold — 주름
- muscle — 근육
- tendon — 힘줄
- joint — 관절
- variation — 차이
- preservation — 보존 처리
- chemical — 화학 물질
- exposure — 노출
- ventilation — 환기
- sharp — 날카로운
- consent — 동의
- donation — 기증
- respect — 존중
- supervision — 감독
- record — 기록하다
- orientation — 놓인 방향
- magnification — 확대
- alternative — 대안
Glossary
Dissection — Structures are separated for examination. The aim is to study arrangement. It differs from casual cutting. 해부.
Anatomy — Anatomy studies body structure. It asks where parts are and how they connect. Structure helps explain function. 해부학.
Physiology — Physiology studies how living bodies work. It includes breathing and circulation. A dead specimen cannot display every process. 생리학.
Organ — Several tissues work together in an organ. The heart is one example. Organs have particular functions. 기관.
Tissue — Similar cells form organised material. Different tissues perform different jobs. Muscle tissue can contract. 조직.
Artery — An artery carries blood away from the heart. Most arteries carry oxygen-rich blood. Pulmonary arteries are an important exception. 동맥.
Vein — A vein carries blood toward the heart. Most veins carry oxygen-poor blood. Pulmonary veins are an important exception. 정맥.
Nerve — A nerve contains bundles of nerve fibres. These carry signals through the body. Damage can affect movement or sensation. 신경.
Connective tissue — This tissue supports or connects body parts. It includes several forms. Tendons are a strong example. 결합 조직.
Ethics — Ethics examines responsibilities and choices. It considers welfare and consent. Scientific usefulness does not settle every ethical question. 윤리.
Observation, Anatomy, and Evidence
Dissection is the careful separation of structures to examine their arrangement. It can involve a plant, a whole animal specimen, or a single organ. The purpose is to answer questions about anatomy, the study of structure. Physiology instead concerns how living systems function. The two subjects connect, but they are not identical. A preserved heart reveals walls and chambers without demonstrating a normal heartbeat. Looking carefully before separating parts protects information about their relationships. An investigator first observes the outside and records orientation. Cutting immediately because a tool is available is enthusiasm, but it is not yet a useful method.
1] How does anatomy differ from physiology?
2] Why should observation come before separation?
Bodies have levels of organisation. Cells form tissues, tissues combine into organs, and organs cooperate in systems. A muscle is not merely a bag of identical material. It contains muscle fibres, supporting connective tissue, blood vessels, and nerves. These structures help it receive oxygen, respond to signals, and transmit force. Examining an organ can reveal how different tissues work together. However, individual cells usually require magnification to see clearly. A hand lens and a microscope answer different questions from a whole-organ examination. Choosing the correct scale prevents a student from expecting every important detail to appear to the unaided eye.
1] How do tissues and organs differ?
2] Why do some investigations require a microscope?
A labelled diagram usually presents a typical arrangement in a tidy form. A real specimen may be less convenient. Structures overlap, colour changes after preservation, and individuals have anatomical variation. Some differences are normal rather than signs of disease. Others result from age, damage, or how the specimen was prepared. Students should record what they actually observe before comparing it with an expected pattern. A textbook is a guide, not a command telling every body how to behave. When a structure seems missing, careful re-examination is better than inventing it. Accurate uncertainty is more useful than a confident but unsupported label.
1] Why might a specimen differ from a diagram?
2] What should a student do when identification is uncertain?
Observation and inference should be recorded separately. An observation might state that a wall is thicker on one side. An inference might propose that this side must produce greater pressure. The explanation becomes stronger when other evidence supports it, such as known function or measurements from living organs. Drawings can emphasise boundaries and connections, while photographs preserve a wider visual record. Neither is automatically accurate. A drawing may omit a feature, and a photograph may hide depth. Useful records include scale, orientation, and clear labels. They allow another person to understand the evidence without being present at the original examination.
1] How does an observation differ from an inference?
2] What makes an anatomical record useful?
What Organs Reveal about Their Jobs
The mammalian heart has four chambers: two atria receiving blood and two ventricles pumping it out. The right side sends blood toward the lungs, while the left sends it through the body. The left ventricle has a thicker muscular wall because it must support the higher-pressure body circulation. Valves help prevent backward flow. A specimen can show these features, although damaged valves or collapsed chambers may be difficult to interpret. The heart is therefore more than a romantic symbol. Its main occupation is moving blood through two connected circuits, with very little interest in poetry and no recognised holidays.
1] Why is the left ventricular wall thicker?
2] What is the role of a valve?
Arteries carry blood away from the heart, and veins carry blood toward it. These definitions depend on direction, not on oxygen content. The pulmonary arteries carry oxygen-poor blood to the lungs, while pulmonary veins return oxygen-rich blood. Many arteries have muscular, elastic walls suited to pressure changes. Veins often have thinner walls, and many contain valves that support one-way flow. Capillaries are extremely small vessels where exchange occurs between blood and tissues. A whole-organ specimen may reveal larger vessels but not the entire microscopic network. Learning the definitions carefully prevents a memorable but incorrect rule about every artery carrying oxygen-rich blood.
1] What defines an artery?
2] Why is oxygen content an unreliable definition?
Lungs contain branching airways leading to tiny air spaces called alveoli. Their thin walls and nearby capillaries allow oxygen and carbon dioxide to move by diffusion. A large combined surface helps exchange occur efficiently. Breathing moves air in and out, while circulation brings blood past the exchange surface. A preserved lung cannot reproduce this complete living process. Its texture and appearance may also change during preparation. The relationship between branching tubes and extensive surface area remains instructive. A lung is not one hollow balloon. It is a complex exchange organ whose internal organisation supports close contact between air and blood.
1] Why is a large exchange surface useful?
2] Why is a lung unlike one hollow balloon?
The digestive tract processes food and absorbs useful molecules. The stomach has muscular walls that mix its contents, while a protective mucus layer helps defend its lining from acid and digestive chemicals. The small intestine has folds and microscopic projections that increase its absorbing surface. Different regions perform different jobs rather than simply passing food along a uniform tube. A whole-organ examination can show connections, wall thickness, and larger folds. It cannot show every enzyme reaction or nutrient crossing a membrane. Understanding this limit matters. Anatomy supplies evidence about the machinery, while physiology explains how the living machinery carries out its work.
1] How does mucus protect the stomach?
2] Why does the small intestine have an expanded surface?
Connections, Comparisons, and Historical Change
Muscles pull when they contract; they do not push bones directly. Tendons connect many muscles to bones, allowing contraction to move a joint. Opposing muscle groups can move a body part in different directions. The familiar upper-arm pair illustrates this arrangement, although real movement involves more than two muscles acting alone. A joint’s shape and supporting tissues restrict the movements it allows. Examining connections therefore explains more than identifying isolated parts. A tendon cut away from its attachment loses much of its mechanical meaning. The useful question is not merely what a structure is called, but what it connects and changes.
1] How does a muscle move a bone?
2] Why should attachments be examined before separation?
Nerves carry signals between the central nervous system and other tissues. Some fibres support sensation, while others help control muscles or organs. Blood vessels often travel near nerves, but the structures have different jobs. A damaged nerve can affect sensation or movement even when a muscle itself remains intact. Gross examination shows major pathways, while detailed nerve structure requires microscopy. It does not reveal thoughts stored as readable messages in a particular strand. Electrical and chemical signalling must be studied in living systems or suitable experiments. Connecting anatomy with function therefore requires several methods, rather than expecting one specimen to explain everything.
1] How do nerves and vessels differ in function?
2] Why cannot gross examination reveal every signalling process?
Comparative anatomy studies similarities and differences between organisms. A vertebrate forelimb may contain corresponding bones despite being used for walking, flying, or swimming. The pattern provides evidence about inherited body organisation and evolutionary relationships. Similar function alone does not prove close relationship, because unrelated groups can evolve similar solutions. Students should distinguish shared underlying structure from a superficial resemblance. Comparing a wing with a forelimb is more informative when joints and bone arrangements are examined. Evolution does not begin every design from nothing. It modifies inherited structures, sometimes producing arrangements that work effectively while retaining signs of their history.
1] What can corresponding bone arrangements reveal?
2] Why does similar function not always mean close relationship?
Andreas Vesalius published De humani corporis fabrica in 1543, using detailed observation to challenge anatomical errors. Earlier authorities had sometimes applied findings from animals too directly to humans. His work helped show why direct evidence matters even when a respected book says otherwise. Anatomical knowledge continued to change after him; one famous book did not complete the subject. New imaging and closer study still reveal overlooked structures and variation. The historical lesson is methodological. Authority can guide investigation, but claims must remain open to checking. Respect for earlier researchers is compatible with discovering that they misunderstood a part or had insufficient evidence.
1] Why was direct observation important to Vesalius’s work?
2] How can evidence challenge authority?
Respectful Study and Modern Alternatives
Human anatomical study depends on consent and respectful handling. Donated bodies are gifts for education or research under specific arrangements, not anonymous objects available for any purpose. Institutions need procedures for authorisation, privacy, secure care, and appropriate treatment of remains. Animal specimens raise questions about welfare, sourcing, and whether the learning goal justifies their use. These concerns remain relevant even when a specimen is already dead. Ethical judgement asks what responsibilities surround the investigation. Students should understand why a specimen is being used and what alternatives exist. Respect does not prevent scientific observation; it establishes conditions under which observation is appropriate.
1] Why does consent matter in human anatomical study?
2] What ethical questions concern animal specimens?
Classroom work requires trained supervision and an approved procedure. Sharp instruments can cause injury, and preserved specimens may involve chemicals that require ventilation and careful handling. Gloves and eye protection must match the actual hazards rather than being treated as magic clothing. Students should follow the teacher’s instructions for tools, hygiene, and disposal. Eating, touching the face, or improvising with unidentified materials creates avoidable exposure. No student should attempt unsupervised work on found animals. An activity’s educational value depends on its organisation and learning goals. A room containing tools and a specimen is not automatically a safe or useful laboratory.
1] Why must protection match the hazard?
2] Why is unsupervised work on found animals inappropriate?
Digital models can display structures transparently, rotate them, and allow repeated practice without damaging a specimen. Physical models also provide useful spatial learning. CT imaging uses X-rays to reveal internal structure, while MRI uses magnetic fields and radio signals to examine many tissues. These methods support medicine as well as education. However, a model represents selected information, and imaging has limits involving resolution, contrast, and interpretation. A simulation may make boundaries cleaner than they are in a real body. The best alternative depends on the learning goal. Finding an organ’s location differs from learning how delicate tissues feel or vary between individuals.
1] What advantages do digital models offer?
2] Why does the best method depend on the learning goal?
Evaluating a teaching method requires evidence about learning rather than assumptions about tradition. Teachers can ask whether students identify structures accurately, explain connections, and remember the material later. Physical specimens, models, images, and simulations may support different skills. Combining methods can help, but adding more activities does not guarantee better understanding. Students who are distressed or have objections need meaningful ways to meet the same learning goals. A carefully designed alternative can preserve educational standards. Anatomical study should improve observation and reasoning, not measure who can appear least bothered. Useful learning is demonstrated by what students understand and can explain from evidence.
1] How can a teacher assess whether a method works?
2] What should an alternative activity preserve?
Homework
Writing tasks
1] Write approximately one page. Explain when opening an object helps understanding and when it destroys evidence.
2] Write approximately one page. Describe the difference between observing a thick wall and explaining its purpose.
3] Write approximately one page. Explain why a real specimen may differ from a labelled drawing.
4] Write approximately one page. Compare what a whole organ and a microscope can reveal.
5] Write approximately one page. Explain the relationship between the heart’s structure and circulation.
6] Write approximately one page. Describe how folded surfaces support absorption.
7] Write approximately one page. Explain why attachments matter when studying movement.
8] Write approximately one page. Argue what respectful handling should require.
9] Write approximately one page. Compare digital models with physical specimens for a specific learning goal.
10] Write approximately one page. Propose how a teacher could assess learning while offering an alternative activity.
Debate topics
1] Should every student use an animal specimen in class?
Side A — Yes, because: 1) real tissues show variation; 2) spatial relationships become concrete; 3) observation skills can develop.
Side B — No, because: 1) alternatives may meet the goal; 2) welfare concerns matter; 3) distress can obstruct learning.
2] Should digital models be the first teaching method?
Side A — Yes, because: 1) they allow repetition; 2) labels are clear; 3) no specimen is damaged.
Side B — No, because: 1) idealised models hide variation; 2) equipment access differs; 3) physical materials develop other skills.
3] Should teachers combine several anatomical learning methods?
Side A — Yes, because: 1) methods reveal different features; 2) students can compare evidence; 3) repeated perspectives support understanding.
Side B — No, because: 1) lesson time is limited; 2) unnecessary activities add cost; 3) a focused method may meet a narrow goal.
Test questions
Answer the following questions in full sentences. If you don’t know the right answer, add a (?) mark, and later we can look at it together.
1] What is dissection?
2] How do anatomy and physiology differ?
3] How are cells, tissues, and organs related?
4] Why is magnification useful?
5] What is anatomical variation?
6] How do observation and inference differ?
7] What should an anatomical drawing record?
8] What are the four mammalian heart chambers?
9] Why is the left ventricle thick-walled?
10] How do valves help circulation?
11] What defines arteries and veins?
12] How do alveoli support gas exchange?
13] How does the stomach protect its lining?
14] How do intestinal folds help absorption?
15] What do tendons connect?
16] What signals can nerves carry?
17] What can comparative anatomy reveal?
18] Why was direct observation historically important?
19] Why do consent and sourcing matter?
20] What are benefits and limits of digital models?
Teaching illustrations and similes
1] Organisation — Rooms combine into a building; living tissues also interact chemically.
2] Observation — A witness describes what happened before proposing why; interpretation still needs evidence.
3] Heart circuits — Two connected delivery routes share a pump system; real circulation has regulated pressure and flow.
4] Valves — One-way doors limit reversal; heart valves respond to pressure differences.
5] Alveoli — Many tiny exchange stalls provide a large area; gases cross biological barriers by diffusion.
6] Intestinal folds — Pleating increases available surface; microscopic structures add further area.
7] Tendons — Strong connecting ropes transmit pull; living tendons have complex tissue properties.
8] Nerves — Communication cables carry signals; biological signalling is not identical to household wiring.
9] Diagram — A transit map simplifies a city; anatomy diagrams omit variation.
10] Consent — A borrowed object comes with conditions; body donation carries deeper personal and ethical responsibilities.
