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