Most mammals have a layer of cutaneous fat beneath the skin, but dromedary camels concentrate fat storage in their hump. What is the significance of that difference for the thermoregulation of camels?
What will be an ideal response?
Subcutaneous fat provides a layer of insulation that impedes the movement of heat across the skin of an animal, slowing heating when the air temperature is higher than the body temperature of the animal and retarding cooling when the body temperature is higher than the air temperature. Camels rely on losing heat at night to dissipate the heat that they store during the day, and a layer of subcutaneous fat would interfere with that heat loss. Of course, subcutaneous fat would retard heating during the day, but camels do that by lying side by side with other camels during the day.
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The end of the aorta occurs when the vessel bifurcates into the
A. brachiocephalic artery. B. subclavian arteries. C. common iliac arteries. D. common carotid arteries. E. None of these answers is correct.
The cochlear duct is filled with __________ and the scala vestibuli is filled with __________.
A. perilymph; endolymph B. endolymph; endolymph C. perilymph; perilymph D. endolymph; perilymph E. cerebrospinal fluid; perilymph
The optic canal is part of the sphenoid bone.
Answer the following statement true (T) or false (F)
Physical evidence that supports the sliding filament theory of muscle contraction includes
A) constant distance between Z lines during contraction. B) decreased width of the H band during contraction. C) increased width of the I band during contraction. D) decreased width of the A band during contraction. E) the I band and H band distance is constant during contraction.