Bio 253 Exam 1 Expected Questions With Verified Answers

BIO 253 EXAM 1 UPDATED ACTUAL QUESTIONS WITH
CORRECT ANSWERS
Question 1.
Responses to an increase in body temperature

ANSWER
-sweating -flushing & redness of skin -Vasodilation of dermal blood vessels



Question 2.
Responses to a decrease in body temperature

ANSWER
-pale skin -contraction of arrector pili -inactivity of sweat glands -Vasoconstriction of dermal blood
vessels



Question 3.
stratum corneum

ANSWER
-the most superficial layer of the epidermis consisting of dead cells -prevents toxins from entering the
body



Question 4.
stratum basale

ANSWER
-the deepest layer of the epidermis consisting of stem cells capable of undergoing cell division to
form new cells -attached to the basement membrane



Question 5.
Layers of the epidermis (superficial to deep)

ANSWER
stratum corneum stratum lucidum stratum granulosum stratum spinosum stratum basale



Question 6.
Primary function of epidermal layer

ANSWER
Prevents water loss & entry of microorganisms




1

, Question 7.
Primary function of sensory receptors

ANSWER
Provides input about environment & environmental conditions



Question 8.
Primary function of dermal blood supply

ANSWER
Maintenance of body temperature



Question 9.
melanocytes

ANSWER
Production of pigment, found in the deepest layers



Question 10.
Keratinocytes

ANSWER
-The most abundant epidermal cells -function mainly to produce keratin -provide waterproofing to the
skin



Question 11.
Which epidermal layer is found only in thick skin?

ANSWER
stratum lucidum



Question 12.
Keratinization

ANSWER
-hardening of cells -occurs in epidermis



Question 13.
Free nerve ending (type of dermis sensory receptor)

ANSWER
-temperature sensors -located throughout dermis & into epidermis




2