Week 6 — The Integumentary System

Human Anatomy and Physiology I Free sample edition

Why this matters

A future nurse checking a scrape, a firefighter sweating in heavy gear, and a hiker with goosebumps on a cold ridge are all watching the same organ work: your skin.

In plain language

Your skin is not a plastic wrap; it is a living organ, and the largest organ system you have. The integumentary system (the skin together with its hair, nails, and glands) guards you from germs and from drying out, feels touch and heat, and helps keep your temperature steady. This week you stack the skin's three layers, from the thin surface layer that has no blood vessels to the fatty layer that sits beneath the skin proper. You put the surface layer's own sublayers in order, from the bottom, where new cells are born, to the top, where dead cells flake away. And you run Week 1's temperature loop again, this time naming the exact skin structure that does each job.

Already covered: Week 1 gave you the feedback loop; Week 5 gave you the four tissue types.
This week: the skin's layers, the epidermal strata, its glands and hair, and thermoregulation.
How they connect: last week's tissues build the skin, and Week 1's loop gets named effectors.
Where we're going next: Week 7, The Skeletal System: Bone Tissue & Structure.

Focus

How does the largest organ act as both a barrier and a thermostat?

By the end of this module, you should be able to:

[ ] name the skin's three layers and say which one carries blood vessels
[ ] order the five epidermal strata from deep to superficial
[ ] match each gland and the arrector pili to its job
[ ] run a temperature reading through the skin's feedback loop

To-do

Plan your week

Read Chapter 6 (40 minutes), then the lecture and slides.
Work the tutorial (60–90 minutes) and practice set (20 minutes).
Run the A&P Lab & Inquiry (2 hours), then the discussion and assignment.
Take the quiz.

This week's checkpoint: say why a scrape that does not bleed stayed in the epidermis.

You've got this

Take it in order; ask your instructor if a step snags.

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