The acetylcholine receptor is
A. a ligand-gated ion channel that produces depolarization by allowing Na+ ions to enter the muscle fiber.
B. a ligand-gated ion channel that produces hyperpolarization by allowing Na+ ions to enter the muscle fiber.
C. a ligand-gated ion channel that produces depolarization by allowing Cl- ions to enter the muscle fiber.
D. a ligand-gated ion channel that produces depolarization by allowing K+ ions to leave the muscle fiber.
E. a metabotropic receptor that stimulates muscle activity by activating second messenger systems within the muscle fiber.
A. a ligand-gated ion channel that produces depolarization by allowing Na+ ions to enter the muscle fiber.
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The bulging of a(n) ____ during the
contraction of the ventricles is referred to as ____.
a. arteriole; pulse b. artery; blood pressure c. arteriole; blood pressure d. artery; pulse e. vein; pulse
The global pattern of air circulation begins at
a. the equator. b. 30 degrees north latitude. c. 30 degrees south latitude. d. 60 degrees north latitude. e. 60 degrees south latitude.
Where would you expect to find methanogens?
A) Near a volcano B) In the surf along the beach C) On the surface of plants D) In the digestive tract of cows
Which statement about the focusing of light by the eyes is true?
A) Squids and many fishes change the shape of their lenses to focus light. B) Mammals focus light when a rigid lens is moved back and forth. C) Mammals use muscles and ligaments to change the shape of their lenses to focus light. D) Mammalian lenses thicken when focused on distant objects.