The nerve fibers in the dermis stimulate
A) muscles and glands in the dermis. B) blood vessels in the epidermis.
C) melanocytes in the epidermis. D) fat cells in the subcutaneous layer.
A
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Identify the FALSE statement.
A) Between nodes of Ranvier, signal conduction is decremental. B) The voltage-gated sodium and potassium channels begin to open during the depolarization. C) The amplitude of the action potential depends on the amplitude of the graded potential that precedes it. D) Under normal conditions, all action potentials in a given cell are identical.
Salt water is considered over 16.5 ppt
Indicate whether the statement is true or false
Diplopia is another name for double vision
Indicate whether the statement is true or false
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.