Lecture Exam 2

Question 1

Function of Integument

Answer 1

Mechanical protection
	Microorganism protection
	Body temperature regulation
	Houses sensory organs
	Elimination of wastes, excretion, secretion
	Adaptive coloration
	Vitamin D synthesis
	Facilitates locomotion
	Storage of fat and glycogen
        Respiration in some vertebrates

Question 2

Epidermis

Answer 2

Stratum germinativum as the deepest layer
	Stratum corneum is the top layer, dead cells that slough off
	Can produce:
		Mucus
		Poisons
		Photophores
		Enamel
                Keratin

Question 3

Keratin

Answer 3

protein that waterproofs skin
kills cells
become more prevalent after transition to land

Question 4

dermis

Answer 4

loose outer stratum spongiosum
Deeper stratum compactum
Mostly strong collagen, less elastic
May contain blood vessels, nerves, epidermal glands
Contains chromatophores, near the epidermis

Question 5

Stratum germinativum

Answer 5

Cell layer in the epidermis that generates new cells

Question 6

Stratum compactum

Answer 6

Dense bands of collagen fibers oriented specifically

Important for mechanical protection, except when there is body armor or scales

Question 7

Melanophores/melanocytes

Answer 7

Contain black, brown or red melanin

located in the dermis

Question 8

Hypodermis/superficial fascia

Answer 8

Loose connective tissue and adipose tissue

Deep to dermis, superficial to muscle

Question 9

Stratum spongiosum ( stratum laxum)

Answer 9

loose outer layer of the dermis

Question 10

Club cells

Answer 10

cells specialized to release an “alarm substance”
found in fishes
causes fishes to scatter