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Integumentary System Lab Guide

This document describes an integumentary system lab activity on examining the human skin. The procedure involves observing and comparing the skin on the palm and back of the hand, examining fingernails, and observing hair and hair roots. Key observations include that the palm skin is thick and firmly attached, while the back of the hand skin is thin and can be lifted. The palm has extra protective layers and wrinkles when closed. Small cuts on the palm draw blood and cause pain due to its nerve endings and blood vessels.

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Kim Ventura
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297 views3 pages

Integumentary System Lab Guide

This document describes an integumentary system lab activity on examining the human skin. The procedure involves observing and comparing the skin on the palm and back of the hand, examining fingernails, and observing hair and hair roots. Key observations include that the palm skin is thick and firmly attached, while the back of the hand skin is thin and can be lifted. The palm has extra protective layers and wrinkles when closed. Small cuts on the palm draw blood and cause pain due to its nerve endings and blood vessels.

Uploaded by

Kim Ventura
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Name: Ken Aldrin V.

De Guzman Section: BSMLS 1-A Date: August 24, 2022

INTEGUMENTARY SYSTEM LAB

Activity 1: Human Skin

MATERIALS

Centimeter Ruler (transparent)

PROCEDURE

1. Palm of hand and Back of hand

a. Look at your hand, back and front. Pull on the skin of the back of your
hand and the palm.

b. In your observations look for any regular patterns that you see. You will
need to describe all that you see.

c. Examine any cuts or scars that may be present on your skin. In your
observations describe the appearance of these features.

d. On the back of your hand, you will find fine hairs. Examine the point at
which the hair protrudes from the skin. Describe the area immediately
around the hair and the angle at which the hair leaves the skin.

2. Fingernails

a. Examine the fingernails. Draw what you see in the observations sections.

3. Hair and hair root

a. Examine the hair shaft and split ends. Draw what you see in your
observations.

OBSERVATIONS:

1. Palm and backhand.

a. Is the skin on the back of your hand firmly attached to the underlying
tissues, or can it be lifted away? (1 point)
- The skin on the back of the hand can indeed be lifted away.
b. How does this compare with the skin on the palm of your hand? (1
point)
- The skin on the palm of the hand is thick and is firmly attached to the
underlying tissue, meaning it cannot be lifted away.

c. Why do you think the skin at this point on the body acts this way?
(2 points)
- Because the palm has a thicker skin, consisting of 5 epidermal layers,
while the skin on the back of the hand has a thinner skin, consisting only
of 4 epidermal layers.

d. What is different in the patterns on the palm and on the back of the
hand?
(2 points)
- The patterns on the back of the hand seem to have different patterns in
texture and coloration, while the patterns on the palm of the hand seem to
have lines that wrinkles when closing your palm.

e. Describe the area immediately around the hairs of your hand. What
angle does the hair leave the skin in most cases? (1 point)
- The area around the hair appears to have different color textures, and the
hair seem to have an angle of 40 to 45 degrees in most cases.

DISCUSSION

1. On your hand, where does the skin appear to be the thickest? Where is it the
thinnest? Why does the skin vary in thickness? (3 points)
- Skin in the palm is the thickest, because the epidermis contains an extra layer,
the stratum lucidum which acts as protection. The thinnest part is at the back of
the hand, because it only consists of 4 epidermal layers.

2. In your experience, do small cuts in the surface of the thick pads on the palms
of the hands draw blood or cause pain? Explain your answer. (2 points)
- Yes, it does draw blood and it also causes pain, because the palm has free nerve
endings which detects pain. Small cuts in the palm draw blood because blood
vessels in the area are damaged.

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