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Skin Labs

A few of the skin labs we did in A&P.

Elisabeth Thomason

on 26 September 2011

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Transcript of Skin Labs

Skin Labs! Collective Purpose: The purpose of these experiments was to better understand skin, nerve receptors, and sweat glands. Lab 1: Demonstrating Adaptation of Touch Receptors Purpose: The purpose of this experiment is to demonstrate how touch receptors adapt to constant pressure. Materials: Four quarters
Stop watch
Pencil/paper Procedures: 1. Have the subject close his/her eyes.
2. Place a coin on the anterior surface of the subject's forearm.
3. Determine how long the sensation persists for the subject.
4. Record your results.
5. Place the coin on a different spot on the forearm.
6. Repeat steps 3 and 4.
7. After the sensation has been lost, stack three coins on top of the first one.
8. Does the pressure sensation return?
9. Record subject's response.
10. Wait until the sensation disappears again.
11. Record time.
12. Put all supplies away. Data: Trial 1:
Trial 2:
Trial 3: 16 seconds
44 seconds
16 seconds Results: Elisabeth Thomason presents... On the third trial, when four coins were stacked on the subject's forearm, it took a shorter amount of time than it did for the sensation of the first coin to disappear. Conclusion: Touch receptors adapt to constant pressure by eventually not sending the sensation of pressure to the brain. Plotting Distribution of Sweat Glands Lab 2: Purpose: The purpose of this experiment was to determine which areas contained more sweat glands. Materials: Tape
Liquid Iodine
Two 1-square inch pieces of paper
Test subject Procedures: 1. Put liquid iodine on an area of your palm approximately the size of the pieces of paper.
2. Repeat step 1 on the anterior forearm.
3. Let the iodine dry.
4. Securely tape the pieces of paper on the dried iodine.
5. Do some sort of physical activity in order to incur a light sweat.
6. Remove the tape and paper.
7. Record observations. Data: Results: Sweat glands are much more densely located on the palm of the hand than the anterior forearm. Conclusion: The blue-black substance, caused by a chemical reaction between iodine and sweat, is more abundant on the palm of the hand than the anterior forearm. Palms Anterior Forearm
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