The enzyme ________ breaks down acetylcholine and removes it from the synaptic cleft.
What will be an ideal response?
acetylcholinesterase
AChE
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Select the correct statement about lymphocytes.
A) The two main types are T cells and macrophages. B) B cells produce plasma cells, which secrete antibodies into the blood. C) T cells are the precursors of B cells. D) T cells are the only form of lymphocyte found in lymphoid tissue.
When you are exposed to bright light, a reflex is initiated and the muscles of your iris contract to decrease your pupil size. The iris muscles are acting as a(n)
A. effector.?B. control center.?C. receptor.?D. postitive feedback.
What occurs when gamma motor neurons to a muscle are activated?
A. The muscle spindle goes slack. B. The contractile ends of intrafusal fibers elongate. C. The muscle lengthens. D. Extrafusal muscle fibers within that muscle are inhibited from contracting. E. Action potential firing increases in afferent neurons from the muscle spindles.
A pole vaulter keeps track of his position in mid-air through
A. pain receptors. B. lamellated corpuscles. C. proprioceptors. D. baroreceptors.