Week 6 A&P Lab & Inquiry: Read the Skin

Human Anatomy and Physiology I Free sample edition

Part 1 — The Big Picture

This week you learned that the skin is an organ built in layers: an avascular epidermis on top, a vascular dermis beneath it holding the glands and hair follicles, and the hypodermis below the skin proper. In this lab you read those layers the way an anatomist does. You open a free virtual anatomy atlas, find a skin slice, identify six structures, and record the layer each one is or sits in, one job it does, and whether that layer has its own blood vessels. Then you check a chatbot's account of the same structures and catch where it mislabels a structure, gives a part the wrong job, scrambles the strata, miscomputes a value, confuses a direction word or tissue type, or invents a number.

Time budget: Plan for about 120 minutes.

Part 2 — The Task

Guiding question: Can you read a slice of skin from the surface down and name, for six structures, the layer each one is or sits in, the job it does, and whether that layer carries blood vessels?

Before you begin — hypothesis: Before you identify anything, write your hypothesis in the if… then… because… form: if you read a skin slice from the superficial side to the deep side, then the glands and hair follicles will or will not all sit in the same layer, because of a reason you can state about where the blood vessels are.

Workshop data: Your own identifications of six skin structures on a free virtual atlas, or the printed fallback descriptions

Source: Six structure identifications you make yourself on a free virtual anatomy atlas with the procedure in Part 3; if you cannot open an atlas, use the six printed descriptions in the fallback, which were written for this lab as a stand-in for an atlas view.

Rows: 6 structures, one row each in the identification table; the planning table has 3 rows that set up the hypothesis rather than data
Columns: structure, layer it is or sits in, one function, and whether that layer has its own blood vessels

Part 3 — Materials & Procedure

Tools and materials

A free virtual anatomy atlas or 3D anatomy viewer (Innerbody, GetBodySmart), a virtual microscope for histology (Histology Guide), free physiology simulations (PhET pH Scale, Membrane Channels, Neuron, Gene Expression Essentials), and a spreadsheet (Google Sheets or any free spreadsheet)

Ways of working

structure-identification-on-a-virtual-atlas
histology-on-a-virtual-microscope
at-home-physiology-measurement-and-data-table

Procedure

Open a free virtual anatomy atlas or 3D anatomy viewer that needs no login, in any web browser, and go to its skin or integumentary system view. If your instructor names a particular atlas, use that one. Tool: A free virtual anatomy atlas or 3D anatomy viewer (Innerbody, GetBodySmart), a virtual microscope for histology (Histology Guide), free physiology simulations (PhET pH Scale, Membrane Channels, Neuron, Gene Expression Essentials), and a spreadsheet (Google Sheets or any free spreadsheet). Check: The atlas's skin or integumentary view is open.
Find a cross-section of skin, a slice cut straight down from the surface. Turn or zoom the view until you can see the top surface of the slice and the layers beneath it. Tool: A free virtual anatomy atlas or 3D anatomy viewer (Innerbody, GetBodySmart), a virtual microscope for histology (Histology Guide), free physiology simulations (PhET pH Scale, Membrane Channels, Neuron, Gene Expression Essentials), and a spreadsheet (Google Sheets or any free spreadsheet). Check: A skin slice shows its surface and the layers below it.
Before you identify anything, write your hypothesis and the view you chose in the first table in Part 4. Tool: A free virtual anatomy atlas or 3D anatomy viewer (Innerbody, GetBodySmart), a virtual microscope for histology (Histology Guide), free physiology simulations (PhET pH Scale, Membrane Channels, Neuron, Gene Expression Essentials), and a spreadsheet (Google Sheets or any free spreadsheet). Check: The first table has its three cells filled.
Read the slice from the superficial side to the deep side. Find the epidermis, the dermis, and the hypodermis, and for each record its layer name, one function, and whether it has its own blood vessels. Tool: A free virtual anatomy atlas or 3D anatomy viewer (Innerbody, GetBodySmart), a virtual microscope for histology (Histology Guide), free physiology simulations (PhET pH Scale, Membrane Channels, Neuron, Gene Expression Essentials), and a spreadsheet (Google Sheets or any free spreadsheet). Check: Three rows of the identification table are filled.
Find a hair follicle with its small arrector pili muscle. Record the layer it sits in, what the muscle does, and whether that layer carries blood vessels. Tool: A free virtual anatomy atlas or 3D anatomy viewer (Innerbody, GetBodySmart), a virtual microscope for histology (Histology Guide), free physiology simulations (PhET pH Scale, Membrane Channels, Neuron, Gene Expression Essentials), and a spreadsheet (Google Sheets or any free spreadsheet). Check: Four rows of the identification table are filled.
Find a sebaceous gland and an eccrine sweat gland. For each, record the layer it sits in, its product and job, and whether that layer carries blood vessels. Tool: A free virtual anatomy atlas or 3D anatomy viewer (Innerbody, GetBodySmart), a virtual microscope for histology (Histology Guide), free physiology simulations (PhET pH Scale, Membrane Channels, Neuron, Gene Expression Essentials), and a spreadsheet (Google Sheets or any free spreadsheet). Check: All six rows of the identification table are filled.
Check every row: each structure names its layer, one function, and a vascular or avascular call for that layer. Tool: A free virtual anatomy atlas or 3D anatomy viewer (Innerbody, GetBodySmart), a virtual microscope for histology (Histology Guide), free physiology simulations (PhET pH Scale, Membrane Channels, Neuron, Gene Expression Essentials), and a spreadsheet (Google Sheets or any free spreadsheet). Check: Every cell of the identification table has an entry.
Answer the analysis questions in Part 5, then complete the critique in Part 6. Tool: A free virtual anatomy atlas or 3D anatomy viewer (Innerbody, GetBodySmart), a virtual microscope for histology (Histology Guide), free physiology simulations (PhET pH Scale, Membrane Channels, Neuron, Gene Expression Essentials), and a spreadsheet (Google Sheets or any free spreadsheet). Check: Every analysis question has a written answer.

Fallback route

When to use it: Use this route if you cannot open a free virtual anatomy atlas, if the atlas will not load on your device, or if it has no skin cross-section view.

Use the six printed descriptions below, written for this lab as a stand-in for an atlas view, to fill every cell of the identification table, then complete every analysis question and the critique from them and submit the same items for equal credit.

This route earns the same credit as the primary route.

Six printed descriptions of what each structure looks like in a skin slice read from the surface down, written for this lab as a stand-in for an atlas.

Fallback model data
Structure	What it looks like in the slice
Epidermis	A thin band of tightly packed, stacked cells along the very top of the slice, flattened at the surface, with no vessels drawn running into it
Dermis	A much thicker band under the top band, a mesh of fibers with small blood vessels, nerve endings, glands, and the roots of hairs set into it
Hypodermis	A soft band of loose tissue and rounded fat cells at the bottom of the slice, under the fiber band, with blood vessels running through it
Hair follicle and arrector pili	A narrow pocket reaching down into the fiber band with a hair growing out of it, and a thin strand of muscle attached to the pocket
Sebaceous gland	A small pouch in the fiber band, filled with an oily product
Eccrine sweat gland	A small gland deep in the fiber band that releases a watery fluid onto the surface of the skin

Part 4 — The Scaffold

State your question and hypothesis before you look, so the identifications test an idea instead of confirming a guess.

Student scaffold table 1
Part of the plan	Your answer
The guiding question in your own words
Hypothesis (if… then… because…)
The atlas view you used to see the skin slice

Record each structure as you find it, reading the slice from the superficial side to the deep side and naming the layer every time.

Student scaffold table 2
Structure	Layer it is or sits in	One function	Does that layer have its own blood vessels (vascular or avascular)?
Epidermis
Dermis
Hypodermis
Hair follicle and arrector pili
Sebaceous gland
Eccrine sweat gland

Part 5 — Analysis Questions

Which of your six structures sit in the dermis, and which single layer has no blood vessels of its own? Name each from your table.
A hiker scrapes a forearm on a rock, and the scrape stings but does not bleed. Using your table, explain which layer the scrape reached and why it did not bleed.
On a cold, windy ridge, the same hiker gets goosebumps and the skin pales. Name the structure from your table behind the goosebumps, the layer it sits in, and which part of the body-temperature loop it plays, and say whether its response opposes or adds to the change.
Name one way an on-screen atlas slice, or the printed descriptions, differs from real skin, and explain how that difference could lead someone to a wrong layer or a wrong vascular call.
Choose one reflection and answer it in three to five sentences: (a) which row of your table would be easiest for a classmate to get wrong, and what cue would you give them? (b) which of this week's swapped pairs (epidermis and dermis, sebaceous and eccrine glands, melanin and keratin) did this lab help you keep apart, and how?

Part 6 — AI-Critique Moment

Choose one equal-credit critique route. Route A: ask an approved AI tool to critique your completed work, then check its response against your own evidence. Route B is the no-AI equivalent printed below.

Approved tools: Claude, Gemini, ChatGPT, Grok, Microsoft Copilot.

Prompt to paste:

I've pasted my completed Week 6 identification table above. For each of the six structures, tell me which layer of the skin it is or sits in, give one function, and say whether that layer has its own blood vessels. Then list the epidermal strata from deep to superficial, name the one found only in thick skin, and say how far a reading of 38.2 °C sits above a set point of 37.0 °C. If you use any measurement or study, give its source.

Test the response for these likely failures:

Chatbots sometimes call the hypodermis the deepest layer of the skin, or label the sebaceous gland a sweat gland.
Chatbots often swap the products, saying keratin colors the skin or that sebaceous glands cool the body.
Chatbots sometimes slip a decimal when subtracting, reporting a reading of 38.2 °C as 1.4 °C above a set point of 37.0 °C.
Chatbots often list the strata from the surface down while calling the list deep to superficial, or slip the lucidum between the basale and the spinosum.
Chatbots sometimes call the dermis superficial to the epidermis, or call the epidermis a vascular connective tissue.
Asked about the skin, chatbots often supply a layer thickness in millimeters or a count of sweat glands that this lab never gave.

In three to five sentences, quote at least two statements from the chatbot that you corrected, give the correction with evidence from your table or Chapter 6, and name one thing the chatbot got right.

Equivalent route (no AI required)

No AI account is required for this lab. Instead of the chatbot, critique this flawed analysis, printed here in full: "In my atlas table, the hypodermis is the deepest layer of the skin and the sebaceous gland is a kind of sweat gland that cools the body. Keratin gives the skin its color. Reading deep to superficial, the strata are corneum, granulosum, spinosum, lucidum, basale. The dermis is superficial to the epidermis, and the epidermis is a connective tissue full of blood vessels. A reading of 38.2 °C is 1.4 °C above a set point of 37.0 °C. An atlas study showed that the epidermis is 0.3 millimeters thick everywhere on the body." Mark it up: quote each flawed sentence, name what is wrong (a mislabeled structure, a wrong structure-to-function pairing, steps out of order, a miscomputed value, a confused directional term or tissue type, or an invented figure), cite the evidence from your table or Chapter 6, and write a corrected sentence beneath it. This route assesses the same objectives (Objective 3 and Objective 1) as the chatbot critique, takes comparable effort (about 30 minutes and 200–300 words), is scored by the same scoring criteria for the same credit, and its own submission artifact is the marked-up flawed analysis, posted in place of the chatbot share link and report.

Part 7 — What to Submit

Both completed scaffold tables, filled from your own atlas work or the printed fallback descriptions
Written answers to all five analysis questions, including your chosen reflection option
The chatbot critique report with its share link, or the equivalent route's marked-up flawed analysis

Deliverable:

A short A&P Lab & Inquiry report on reading the skin: two completed tables (the plan with your hypothesis, and the six-structure identification table with layers, functions, and vascular calls), written answers to five analysis questions, and a critique of a chatbot's account of your structures, or, on the equivalent route, a marked-up correction of the printed flawed analysis. Submit in any accessible file type or as a link; a recorded response may be submitted as audio or video with a transcript, or as text. Choose a written, recorded, or visual form for your answers; every form is graded by the same scoring criteria.

Rubric

The rubric below shows how each submitted part is evaluated; bands are full, partial, or none.

Workshop evaluation criteria
Criterion	Full	Partial	None
Hypothesis and view set before identifying	An if… then… because… hypothesis about where the structures sit appears before the identifications, and the student names the atlas view or fallback used to see the skin slice.	A hypothesis appears but lacks a because clause or is written after the identifications, or the view used is missing or unclear.	No hypothesis and no statement of the view used.
Identification table with correct layers and functions	All six rows name the correct layer, reading the slice superficial to deep, and pair each structure with a correct function.	Three to five rows are correct, or a structure is placed in the wrong layer, or a function is swapped between two structures.	Fewer than three rows are correct, or the table is missing.
Vascular and avascular calls	Every row makes the correct vascular or avascular call for its layer, with the epidermis avascular and the dermis and hypodermis vascular.	Calls are made for some rows, or the epidermis is called vascular in one row.	No vascular or avascular calls are made.
Analysis in words	Questions 1 to 4 are answered accurately: the accessory structures placed in the dermis with the epidermis avascular, the unbleeding scrape tied to the epidermis, the arrector pili named as an effector that opposes the drop, and one concrete limitation of the atlas or descriptions; the chosen reflection option is answered.	The questions are attempted, but one or two answers misplace a structure, call the epidermis vascular, or give a vague limitation.	The analysis questions are not answered.
Critique of the chatbot or of the printed flawed analysis	On either route, at least two errors are quoted and corrected with evidence from the student's own table or Chapter 6, and one correct point is acknowledged; both routes earn this band equally.	On either route, errors are named but corrected without evidence, or only one error is caught.	No critique appears on either route, or pasted output is submitted without any checking.

Quality Gate

Every identification comes from your own atlas work or the printed fallback descriptions, never from memory or a chatbot.
The slice was read from the superficial side to the deep side, and every structure names its layer.
Every vascular or avascular call matches the layer's tissue type, with the blood vessels placed in the dermis and the hypodermis, never the epidermis.
Every function pairs a structure with its own product or job, such as sebum for the sebaceous gland and cooling sweat for the eccrine gland.
No measurement, study, or source is invented anywhere in the submission.
The critique quotes the chatbot or the flawed analysis and corrects at least two errors with evidence from your table or Chapter 6.

Built with The Course Maker · samples.thecoursemaker.com