lab 1

Powerful Essays
Topics: Skin, Epidermis
Integumentary System

Laszlo Vass, Ed.D. Version 42-0280-00-01

Purpose:

What is the purpose of this exercise?

Are there any safety concerns associated with this exercise? If so, list what they are and what precautions should be taken.

Exercise 1: Structures of the Skin
Observations

Before beginning, set up a data table similar to this Data Table 1. Fill in the names of the numbered structures.

Skin Diagram
(National Library of Medicine at http://nih.nlm.gov)

Data Table 1: Structures of Skin
Item
Name
1.
Hair
2.
Piloerector Muscle
3.
Sebaceous Gland
4.
Hair Follicle
5.
Sweat Gland
6.
Lamellar corpuscle
7.
Hypodermis
8.
Dermis
9.
Epidermis
10.
Tachtile corpuscle
11.
Dermal papilla
12.
Sweat pores

Questions

A. How does the skin tan when exposed to ultraviolet light?

Melamin synthesis are stimulated by the UV light which darkens the skin.

B. Describe the functions of the epidermis.

The epidermis is the outermost layer of the skin. This layer of skin acts as a barrier to help protect the body from the environment.

C. Describe the functions of the sweat glands. The sweat glands help cool the body, excrete waste, and can secrete sex pheromones

D. Compare the structure of the epidermis to that of the dermis.

The dermis is well supplied with blood cells while the epidermis only contains dead cells. The epidermis layer relies on the dermis layer for nutrients. Lastly the epidermis is the hard outer layer of the skin and the dermis is the layer beneath the epidermis.

E. Fill in the following table by either inserting the name of the structure/cell or by giving its function(s):

Structure/Cell
Function(s)
Melanin
Makes a pigment for tanning
Langerhans cells
Stands guard against toxins, microbes and other pathogens

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