Course: Anatomy & Physiology I (BIOL 2301 + BIOL 2101) · Silver Oak University (fictional sample) · Prof. Navarro
Module: Week 6 of 16 · Fall 2026 · in-person, two 75-minute lectures + one weekly lab
Objective covered: Objective 3 — Describe the structure and functions of the four tissue types and the integumentary system, relating each structure to its function and to homeostasis.

This file holds two pieces: (A) the Module 6 Overview page ("Start Here") and (B) the Welcome Announcement that drips out when the module opens. Dates below assume a Tuesday/Thursday lecture pattern with Week 6 meeting Tue Oct 6 and Thu Oct 8, a lab that same week, and end-of-week work due Sunday Oct 11, 11:59 p.m. Adjust the day-of-week and times to match your section.

(A) Module 6 Overview — Start Here

Welcome to Week 6: Your Largest Organ

This is your home base for the week. Read it first, then work the checklist below from top to bottom. Everything you need is linked inside the module.

Last week you learned the four tissue types. This week you get to watch them assemble into a real, working organ — the skin. Most people think of skin as a wrapper, but it is the body's largest organ, about a sixth of your body weight, and it does serious physiological work every second: it keeps the world out, and it helps keep your temperature in. We'll keep leaning on the two big course threads — structure determines function (the skin's layered design is exactly what makes it a barrier) and homeostasis (the skin is a frontline temperature regulator).

The week's big question

"How does your largest organ act as both a barrier and a thermostat — and how does its layered structure make both jobs possible?"

By Friday you'll name the skin's layers in order, pair each structure to its job, and trace thermoregulation as a feedback loop — the same sense-and-correct logic from Week 1, now running on your own skin.

By the end of this week, you can…

Use this as a checklist. If you can do all four out loud, you're ready for the quiz.

• [ ] Name the layers of the skin top→deep — epidermis (keratinized stratified squamous epithelium, avascular), dermis (connective tissue with vessels/nerves/glands/follicles), hypodermis (adipose — not technically part of the skin).
• [ ] Order the epidermal strata deep→superficial — stratum basale → spinosum → granulosum → (lucidum, thick skin only) → corneum — and say where new cells form (basale).
• [ ] Tell melanin from keratin (pigment/UV shield vs. toughness/waterproofing) and match the glands to their secretions (sebaceous → sebum/oil; eccrine sweat → cooling).
• [ ] Trace thermoregulation as a homeostatic loop (receptor → control center → effector) and list the skin's five functions (protection, thermoregulation, sensation, vitamin D, excretion).

What's due this week, and when

Work these in order — each one gets you ready for the next.

Heads-up on the AI tools: you'll use a chatbot to draft and explain, and then you judge its work against what we cover in class. Chatbots routinely claim "the epidermis is full of blood vessels" (it's avascular), scramble the epidermal layer order, or swap melanin and keratin. Catching the model is the point — in the tutorial, the assignment, and the lab.

Late policy reminder: 10% off per day late. If life happens, reach out before the deadline — I'd much rather hear from you early.

How to succeed this week

• Lead with the idea, not the jargon. Every term is a plain-English idea first (the epidermis is the surface; the dermis is the living layer underneath; "avascular" just means "no blood vessels"). The vocabulary comes after the picture clicks.
• Memorize two tiny hooks. "Epidermis = surface, avascular, stratified squamous." And "Keratin = toughness; melanin = pigment + UV shield."
• Walk the layers like an elevator. Cells are born deep (stratum basale) and pushed up; by the time they reach the top (stratum corneum) they're dead, flat, keratin-filled armor. The order is the story.
• Tie thermoregulation back to Week 1. Sweating and blood-vessel dilation are effectors in a negative-feedback loop. If you can do the cold-shivering loop, you can do the overheating-sweating loop.
• Treat the chatbot as a smart intern, not an oracle. It drafts; you check. The "epidermis has blood vessels" error is the one to hunt this week — and in the clinic, catching a confident mistake isn't optional.

You don't need anything from outside this course — just your own skin to look at and a willingness to be precise. Come to class ready to explain why you get goosebumps. See you Tuesday.

(B) Welcome Announcement — Module 6

Release setting: post on the module's start day (offset = 0 days), i.e., Tue Oct 6, 2026 — not before. If your platform won't preserve the scheduled date on import, post this as a draft labeled "Release: Tue Oct 6."

Subject: Welcome to Week 6 — why do you get goosebumps? 🩻

Hi everyone,

Quick warm-up before we start: step into a cold room and your arm hairs stand up — why? Each hair has a tiny muscle attached (the arrector pili); when you're cold, it contracts and pulls the hair upright, trying to trap warm air. It's a leftover reflex on us, but it's a perfect window into this week: your skin is constantly sensing and responding to keep you in balance. Goosebumps are a thermoregulation move — same toolkit as sweating and blood-vessel changes.

This week — The Integumentary System — we tackle the big question: How does your largest organ act as both a barrier and a thermostat, and how does its layered structure make both jobs possible? By Friday you'll name the skin's layers in order, tell melanin from keratin, match the glands to what they make, and trace thermoregulation as a feedback loop.

Three things not to miss:
1. Lecture Tutorial 6 — work through the skin layers, the epidermal strata, melanin vs. keratin, the glands, and thermoregulation with one approved chatbot (Gemini, Claude, or ChatGPT) and submit the share link. You'll catch the model's mistakes — the famous one this week is a chatbot insisting "the epidermis has lots of blood vessels." (It's avascular.) Due Sun Oct 11.
2. Lab 6 ("Read the Skin"), Quiz 6, Discussion 6, and Assignment 6 also close Sun Oct 11 — the lab uses a free virtual anatomy atlas, so start early and explore the skin in 3D.
3. Open the Start Here page first — it lays out everything in order with due dates.

One promise: this is a course about how the body is built and how it works — not a glossary to memorize. We lead with plain-language ideas every week and tie every structure to what it does. By Friday, the next time you sweat on a hot day, you'll know exactly which structures are at work and why — a negative-feedback loop running on your own skin.

Bring your curiosity (and your own skin to look at) to class on Tuesday.

See you soon,
Prof. Navarro