Identify seven skin structures in an original diagram
Follow each leader to hair, muscle, gland, receptor, neurone, vessels or fat.
Section B13.3 · Homeostasis
Mapped to the named 0654 section using teaching from the corresponding single-science course. A 0654-specific review of every Core and Supplement objective is still in progress. Written practice is self-checked; it does not demonstrate supervised laboratory competence or award an official Cambridge grade.
Before you begin
- Recall hormone production and blood transport, respiration, liver storage and electrical impulses along neurones.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which structure carries an impulse towards the central nervous system?
What you will learn
- Identify the seven required structures
- Separate a receptor from its sensory nerve process
Identify seven skin structures in an original diagram
| Feature | Meaning |
|---|---|
| A–C | Hair; hair erector muscle; sweat gland |
| D–E | Receptor; sensory nerve process |
| F–G | Blood vessels; fatty tissue |
| Scope | Schematic; sensory process rather than whole neurone |
Identify the seven required structures
The original teaching diagram shows a simplified hairy-skin section. A points to the hair projecting above the epidermis. B ends on the oblique hair erector muscle attached to the follicle. C points to a coiled sweat gland with a duct reaching the surface. These endpoints identify structures rather than the letters’ positions in empty space.
D marks a receptor, and E marks a continuous sensory nerve process leading from it. A receptor detects a stimulus; a sensory neurone carries an electrical impulse towards the central nervous system. The drawn nerve process represents part of the neurone, not a complete cell body or an entire route to the brain. The generic receptor is not labelled as a particular temperature receptor.
Separate a receptor from its sensory nerve process
F points to the blood vessels in the dermal network. G points to fatty tissue below the dermis, in the subcutaneous region. Fat contributes insulation, while vessels transport blood. The diagram simplifies shapes, proportions and colours; it is not a microscope photograph or a measurement of vessel diameter.
Practise by following every leader and then checking all seven names. Hair and its erector muscle are distinct structures, and a sweat gland is distinct from its surface pore. Skin identification is a prerequisite for temperature regulation, but identifying one structure does not yet explain sweating, shivering or arteriole control. Those mechanisms are developed in later lessons.
Sources for this lesson
Pause and explain
Which pair must remain separately identified?
Worked example
Identify A–G in the original model.
Show the worked solution
- A hair; B hair erector muscle; C sweat gland.
- D receptor; E sensory nerve process; F blood vessels; G fatty tissue.
Answer A hair; B hair erector muscle; C sweat gland; D receptor; E sensory nerve process (part of a sensory neurone); F blood vessels; G fatty tissue.
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Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Name all seven A–G endpoints in the original diagram.
Give me a hint
Follow leaders before using the key.
Compare my reasoning
- Identify hair, muscle and coiled gland.
- Identify receptor, nerve process, vessels and fat.
A hair; B hair erector muscle; C sweat gland; D receptor; E sensory nerve process (part of a sensory neurone); F blood vessels; G fatty tissue.
Look for these in your work
- Identify all seven endpoints
- Keep receptor and neurone distinct
Distinguish the roles of D and E.
Give me a hint
Detection precedes impulse transmission.
Compare my reasoning
- D is the stimulus-detecting receptor.
- E is a sensory neurone process carrying an electrical impulse.
D detects a stimulus; E represents a sensory neurone process carrying an electrical impulse towards the central nervous system.
Look for these in your work
- State receptor detection
- State sensory impulse transmission
Why can this model identify fatty tissue without proving its exact thickness or the full neurone route?
Give me a hint
Identify what is schematic and what is omitted.
Compare my reasoning
- Proportions are simplified and not a measurement scale.
- Only a sensory nerve process is drawn, without the complete cell body or CNS route.
The model identifies structures but is not to scale; it shows only part of the sensory neurone and does not provide a full CNS route or exact tissue thickness.
Look for these in your work
- Use the diagram’s scope
- Identify omitted structures
Common mistakes
- Naming the letter location instead of its leader endpoint.
- Calling the nerve process a complete neurone cell body.
What can you explain now?
Which pair must remain separately identified?
Compare with the explanation
Receptor and sensory nerve process
They have different roles and separate endpoints.
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Make it stick
Identify all seven structures by their endpoints and explain receptor versus sensory-neurone roles.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.