The second messenger mediating the effects of norepinephrine on the heart would be
A) increased intracellular Ca2+.
B) decreased Ca2+.
C) increased cyclic AMP.
D) decreased intracellular cyclic AMP.
Correct Answer:
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Q64: All adrenergic receptors act via
A)ligand-gated channels.
B)sodium-potassium pump.
C)H-proteins.
D)G-proteins.
Q65: The _ has both a1 and b1
Q66: Postganglionic _ nerves release acetylcholine.
A)sympathetic
B)parasympathetic
C)somatic
D)sensory
Q67: The swellings on postganglionic axons that contain
Q68: Alpha2-adrenergic receptors on presynaptic axon terminals,when stimulated,cause
A)increased
Q70: Blocking 2-adrenergic receptors prevents airway
A)constriction.
B)dilation.
Q71: Fibers that secrete acetylcholine are called cholinergic
Q72: Fibers that secrete norepinephrine are called adrenergic
Q73: The neurotransmitter released at terminal ganglia is
A)acetylcholine.
B)dopamine.
C)epinephrine.
D)norepinephrine.
Q74: _ selectively stimulates a2 receptors in brain
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