Week 1, Integument, thermoregulation and homeostasis Flashcards
The ________ glands in the axilla become active at the time of puberty.
apocrine sweat
Which of the following statements is CORRECT?
Answers:
a.
core temperature is maintained within a narrow range between 36.7°C and 37.2°C.
b.
core temperature is affected more by changes in ambient temperature than shell temperature.
c.
core temperature is maintained at a homeostatic level of 37.5°C.
d.
females always have a higher core temperature compared to males.
a.
core temperature is maintained within a narrow range between 36.7°C and 37.2°C.
The ________ in keratinocytes protects the epidermis and dermis from the harmful effects of sunlight.
melanin
Thermoreceptors
Answers:
are found within the dermis.
are free nerve endings.
for “cold” are structurally indistinguishable from those for “warm.”
are more numerous for cold than for warm temperatures.
All of the answers are correct.
All of the answers are correct.
The layer of the skin that provides a barrier against bacteria as well as chemical and mechanical injuries is the
epidermis.
Which of the following is formed in the skin when it is exposed to sunlight?
d.
vitamin D.
Which of the following happens if body temperature rises above normal?
Blood flow to the skin increases.
When you stand barefoot on the bathroom floor tiles in winter and you feel cold, heat is being lost by;
conduction.
The protein that reduces water loss at the skin surface is
keratin.
What part of the brain is involved in thermoregulation?
hypothalamus
In an environment that is cooler than your body, you lose heat in a process called
radiation.
How do nutrients reach the epidermis of the skin?
nutrients move by diffusion from the papillary blood vessels in the dermis into the epidermis
Which of the following individuals would lose heat the fastest in a cold room?
a newborn infant
Merocrine sweat glands
secrete a watery fluid directly onto the surface of the skin.
Nail production occurs at the nail
root.
Glands that discharge an oily secretion into hair follicles are ________ glands.
sebaceous
All of the following occur when the temperature of the preoptic area of the hypothalamus drops below its thermostat setting except
Answers:
blood flow to the skin increases.
shivering thermogenesis occurs.
nonshivering thermogenesis occurs.
epinephrine levels rise.
blood returning from limbs is shunted to deep veins.
blood flow to the skin increases.
Thermoregulation involves a steady core body temperature near:
37.5°C
The two components of the integumentary system are the
cutaneous membrane and accessory structures.
When the arrector pili muscles contract,
“goose bumps” are formed.
The loss of heat energy by vaporizing water is called
evaporation.
More than half the heat is lost from the body indoors through the process of
radiation.
The heat-gain center for thermoregulation
Answers:
resides in the pre-optic hypothalamus.
activates shivering thermogenesis.
activates nonshivering thermogenesis.
activates skin vasoconstriction.
All of the answers are correct.
All of the answers are correct.
Each of the following is a function of the integumentary system except
synthesis of vitamin C.
