Welcome to the Quiz!
This quiz contains 11 questions from a mix of 1 subtopics.
What happens to the metabolic rate of ectotherms as environmental temperatures increase?
it decreases
it increases
it initially increases then decreases
it remains steady
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Why can endotherms remain active across a wider range of temperatures compared to ectotherms?
endotherms have a lower and more variable metabolic rate
endotherms have mechanisms to regulate their internal temperature
endotherms rely on the environment to regulate their temperature
endotherms do not have precise temperature regulation
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What is the purpose of vasodilation in endotherms?
to increase blood flow to the skin
to conserve body heat
to reduce blood flow to the skin
to maintain a steady metabolic rate
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How does shivering help endotherms regulate their temperature?
it promotes evaporative cooling
it generates heat through increased cellular respiration
it flattens hairs to increase heat loss
it increases blood flow to the skin
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What happens to hair follicles when endotherms need to reduce their body temperature?
erector pili muscles relax, flattening the hairs
hair falls out to increase heat loss
more hair grows to provide insulation
erector pili muscles contract, erecting the hairs
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Which hormone(s) speed up cellular metabolism to generate heat?
(Select all that apply)
insulin
thyroxine
glucagon
adrenaline
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What structure in the brain acts as the thermostat for coordinating thermoregulation?
hypothalamus
cerebellum
medulla oblongata
pituitary gland
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What does the hypothalamus send signals to in order to restore normal body temperature?
the environment
the cerebral cortex
other parts of the brain only
effectors like sweat glands and muscles
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Vasoconstriction reduces blood flow to the skin in order to:
promote evaporative cooling
increase metabolic rate
reduce heat loss
increase heat absorption
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Why do ectotherms seek shade when their body temperature becomes too high?
to promote evaporative cooling
to flatten their hair for insulation
to reduce heat absorption from the environment
to increase metabolic heat production
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What happens to sweat production when mammals need to increase their body temperature?
sweat becomes more concentrated
sweat production decreases
sweat production increases
there is no change in sweat production
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