Question

anatomy & physiology
quiz 2 the integumentary system

1. true or false: the skin is the largest organ in the human body
2. label the layers of the skin:
3. which protein gives skin its protective quality?

a. melanin
b. vitamin d
c. keratin
d. hemoglobin
e. collagen

1. which layer of the skin contains keratinocytes & melanocytes?

a. dermal papillae
b. dermis
c. epidermis
d. hypodermis

1. what area of the skin structure is responsible for \goose bump\ formation of the skin?

a. pacinian corpuscle
b. arrector pili muscle
c. sensory nerve fiber
d. meissners corpuscle

1. which of the following lesions is a vascular lesion?

a. tumor
b. macule
c. ecchymosis
d. plaque

Explanation:

1. The skin is indeed the largest organ in the human body, covering the entire exterior of the body and performing multiple functions like protection, temperature - regulation etc.
2. The layers of the skin from top to bottom are epidermis, dermis, and hypodermis.
3. Keratin is a protein that provides protection to the skin by forming a tough, waterproof layer.
4. Keratinocytes and melanocytes are found in the epidermis. Keratinocytes produce keratin and melanocytes produce melanin which gives skin its color.
5. The arrector pili muscle contracts to cause "goose bumps" in response to cold or emotional stimuli.
6. Ecchymosis is a vascular lesion which is a collection of blood outside of blood vessels, often seen as a bruise.

Answer:

1. True
2. Epidermis, Dermis, Hypodermis
3. c. Keratin
4. c. epidermis
5. b. Arrector Pili Muscle
6. c. Ecchymosis