Skin: structure, function, and tissues

Learn independently About 30–45 minutes · notebook or plain paper

You can complete this route without a teacher demonstration, partner, sign-in, or submission. Use only the virtual tools; never cut or pull real skin.

1. Notice first · 5 minutes. Open the skin model. Rotate and zoom, then record three observations, two interesting details, and one question. Keep observations separate from guesses about function.
2. Explore the layers · 10–15 minutes. Follow the model’s on-screen cut → release → lift → release → peel instructions for the epidermis and then the dermis. You can operate both stages yourself. Use Inspect and the structure buttons; read their information cards. Record two visible details and one function for the epidermis, dermis, and hypodermis. The enlarged model is not to scale, and you cannot infer texture from touch.
3. Connect structure to function · 5–10 minutes. Draw a side view with six labels: epidermis, dermis, hypodermis, sweat gland, blood vessel, and hair follicle. Mark the hypodermis as below skin proper. Compare the placement with the model and the linked OpenStax skin diagram.
4. Explain, check, revise · 10–15 minutes. Attempt the three questions below on paper before opening their explanations. Correct your reasoning in another color or add a short revision note. Finish with two sentences linking one observed structure to its function, then revisit your opening question.

If the model will not load: use the linked skin diagram and this page’s explanations. Label your record “diagram observations” rather than claiming a virtual dissection. You can still draw, reason, and complete the self-check.

Classroom pathway Optional · original 45-minute sequence

The directions below retain the partner work, teacher demonstration, journal format, and pacing for an assigned class. Independent learners can use the route and self-check above instead. Classroom assessment instructions come from your teacher.

Protected teacher guide and sample answers — access remains restricted; it is not needed to finish the public practice.

1. Explore first: 3–2–1 0–7 minutes

1. For the first 5 minutes, work independently before the teacher explains the structures. Open the model and try Rotate, Close-up, and available tools. If you cut, follow the on-screen cut → release → lift → release → peel order. You do not need to finish now.
2. In your journal, write “Skin Dissection Lab,” your name, date, period, and “3–2–1 Exploration.” Record 3 things you notice, 2 things you find interesting, and 1 question. Everyday words are welcome; scientific names are not required yet.
3. Spend 2 minutes sharing one observation and your question with a partner. Listen for a similarity or difference. Keep your question to revisit later.

2. Fab 5 hook: dermis 7–10 minutes

1. With your teacher, say “dermis” (DUR-mis) three times.
2. Use this definition: the connective-tissue layer under the epidermis. Connective tissue supports and connects body parts.
3. Example: blood vessels and sweat glands are found in the dermis.
4. Context: a cut reaching the dermis can bleed because it contains blood vessels.
5. Tell your partner a sentence using dermis. Write your sentence in your journal.

3. Guided dissection and observations 10–25 minutes

1. Take 2 minutes to add your partner’s name, the purpose (“Identify and describe skin structures and explain how they help the body”), and two predicted structures you expect to examine, with a reason for each.
2. Watch the teacher demonstrate for 2 minutes. If you cut during exploration, use Reset hand when asked. It resets the model, not your journal.
3. Write a short procedure: observe surface → cut, lift, and peel epidermis → cut, lift, and peel dermis → inspect structures. Copy the table below. Record the surface before cutting.
4. Partner A selects Scalpel and follows the bright tip until the cut reaches 100%. Release. Select Forceps and lift the edge to 30%. Release. Start a new drag and peel to 100%. Stop and record the dermis.
5. Switch operators. Partner B repeats cut → release → grip/lift → release → peel for the dermis. Stop and record the hypodermis.
6. Use Inspect and the structure-name buttons. Add a function for each region from the information cards. Each partner completes their own table. Do not describe touch or texture you cannot feel.

Copy this table into your journal. Leave 3–4 lines per row; record at least two visible details such as color, shape, or location.

4. Collaborative practice: labeled drawing 25–35 minutes

1. For 2 minutes, select Sweat gland, Blood vessel, and Hair follicle. Tell your partner where each is and what it does.
2. For 6 minutes, draw one large side-view cutaway in your own journal, showing the regions from surface downward. Title it “Skin layers and structures.”
3. Label epidermis, dermis, hypodermis, sweat gland, blood vessel, and hair follicle. Use straight label lines. Write “Hypodermis: below the skin.” Add one observation beside the drawing.
4. Use the last 2 minutes to compare with your partner and correct labels. Each student needs a separate drawing.

5. Independent analysis 35–42 minutes

Work independently. Number your answers 1–3; write 1–2 complete sentences for each using observations and the information cards.

1. Why does a scratch limited to the epidermis not bleed? Why can a cut into the dermis bleed?
2. How do sweat glands and blood vessels help the body cool? Explain what must happen to sweat for it to cool the body.
3. Which two layers form skin itself? What is one job of the hypodermis below them?

6. Conclusion and final check 42–45 minutes

1. Independently write 2–3 sentences explaining how skin structure supports function. Include one observation as evidence.
2. Revisit your 3–2–1 question: answer using an observation, or state what you still need to investigate. Check what you would keep or change in your prediction.
3. Check for all six sections, three table rows, six drawing labels, and three analysis answers. Show your science journal to your teacher. Do not submit answers on this website.