A protein is found in blood that is produced by the pancreas and acts on receptors of cells in the liver. What type of physiological regulator is it most likely to be?
A. a hormone
B. an autocrine signal
C. a paracrine signal
D. a neurotransmitter
E. an enzyme
A
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A person with an endocrine disorder wants to know the difference between a hormone and a neurotransmitter. What should be explained to this person?
A. Hormones are released at synapses. B. Neurotransmitters affect a single cell, whereas hormones affect multiple cells. C. Hormones affect the target tissue immediately and very briefly. D. Neurotransmitters are released into the bloodstream.
The ________ nerve carries impulses to the diaphragm.
A. phrenic B. vagus C. diaphragmatic D. thoracic
When are the semilunar valves closed?
A. When the ventricles are contracting B. When the ventricles are relaxing C. When the atrioventricular valves are closed D. When the atria are relaxing E. When the pressure is greatest in the ventricles
The pampiniform plexus provides which of the following testicular functions?
(A) lymphatic drainage (B) blood supply (C) nerve supply (D) thermoregulatory system (E) hormonal production