PRE-LAB QUESTIONS

1. Describe sebaceous glands, sudoriferous glands, and hairs with regard to skin function.

2. What is the function of melanin?

3. List the similarities and differences among the layers of the epidermis.

EXPERIMENT 1: MICROSCOPIC SLIDE EXAMINATION OF SKIN

Post-Lab Questions

4. Identify the indicated components in the slide below.

A ____________________

B_____________________

C_____________________

D_____________________

5. Indicate whether the statement pertains to the epidermis or dermis.

a. This layer consists of the papillary layer and the reticular layer. ______________

b. Composed of keratinized, squamous epithelium. ______________

c. Langerhans cells and Merkel cells reside in this layer. ______________

d. Composed of dense, irregular connective tissue. ______________

e. The fingerprint pattern, unique to each individual, is created in this layer. ______________

f. Outermost layer of skin. ______________

g. This layer has laminated granules and keratohyalin granules within the stratum granulosum. ______________

h. The dense supply of blood allows this layer to play a part in body temperature regulation. ______________

6. List the five layers of the epidermis, from most internal to most external, and describe their functions.

7. List the two layers of the dermis, from internal to external, and describe their function.

EXPERIMENT 2: SWEAT GLAND DISTRIBUTION

Data Sheet

Table 2: Sweat Gland Distribution

Body Region

Sweat Glands/cm2

Right Anterior Forearm

Right Palm

Right Anterior Thigh

Right Anterior Foot

Post-Lab Questions

8. What area of your body had the greatest density of sweat glands? What area had the lowest? Why do you think that is?

9. What is the purpose of sweat glands?

10. If you were to perform this test on a friend, do you believe the results would be similar or different to yours? Why or why not?

EXPERIMENT 3: SKIN RECEPTORS

Data Sheet

Table 3: Two-Point Discrimination Test Results

Body Region

Left-Side Caliper Measurement

Right-Side Caliper Measurement

Scalp

Forehead

Lips

Front of Neck

Back of Neck

Shoulder

Upper Arm

Elbow

Forearm

Wrist

Back of Hand

Palm of Hand

Tip of Thumb

Tip of Index Finger

Tip of Middle Finger

Tip of Ring Finger

Tip of Pinkie

Post-Lab Questions

11. Which region was the most sensitive to this test? Which was least sensitive?

12. Can you think an advantage to having more touch receptors in the area that you found to be most sensitive?

13. Was there a difference between the measurements on the left and right sides of the body? Why or why not?

 

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