Vasoconstriction helps an animal retain heat by
a. generating heat through the metabolic activity of the vascular musculature.
b. causing piloerection, which increases the amount of air (a poor thermal conductor) trapped next to the skin.
c. directing blood away from the body surface, avoiding the transfer of heat from the blood to the environment.
d. causing the skin of the animal to blanch, increasing the ability of radiant energy to penetrate to the animal's core.
e. none of these.
C
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Matching
A) A band B) Z discs C) I band D) Myosin 22) A sarcomere is the distance between two ________. 23) The ________ contains only the actin filaments. 24) The thicker filaments are the ________ filaments. 25) Both actin and myosin are found in the ________. 26) The myosin filaments are located in the ________.
Permeability is a property of
A) membranes. B) solvents. C) solutes. D) proteins. E) ions.
At rest the heart rate is usually ________ by parasympathetic control.
A) increased B) unchanged C) decreased D) shut down E) None of the answers are correct.
Epithelia specialized for providing sensations of smell, taste, sight, equilibrium, and hearing are known as
A) neuroepithelia. B) psychoepithelia. C) neuropsychoepithelia. D) multilaminar epithelia. E) protective epithelia.