Question

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. meissner’s 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.
2. The three main layers of the skin are the epidermis, dermis, and hypodermis.
3. Keratin is a protein that provides protection to the skin by forming a tough - outer layer.
4. Keratinocytes and melanocytes are located in the epidermis. Keratinocytes produce keratin and melanocytes produce melanin.
5. The arrector pili muscle contracts to cause "goose bumps" by pulling on hair follicles.
6. Ecchymosis is a vascular lesion, often known as a bruise, caused by bleeding under the skin.

Answer:

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