Which of the following is TRUE regarding pituitary growth hormone (GH)?
A. The liver produces a factor that mediates the metabolic actions of GH.
B. GH stimulates insulin-like growth factor-1 (IGF-1) production by the liver and by many other cells.
C. GH increases the sensitivity of tissues to the action of insulin.
D. GH exerts negative feedback on its own production by inhibiting the hypothalamic secretion of somatostatin.
E. IGF-1 stimulates the secretion of GH by anterior pituitary gland cells.
B
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When a neurotransmitter like acetylcholine is acting in an excitatory manner which of the following is likely a result of the acetylcholine acting on the post synaptic cell?
A) Chemically gated chloride channels will open. B) Chemically gated potassium channels will open. C) Chemically gated sodium channels will open. D) Chemically gated sodium channels will be closed.
The layer of stretchy fibers found between the media and adventitia is called the ________.
Fill in the blank(s) with the appropriate word(s).
When calcium ion binds to troponin,
A) tropomyosin moves into the groove between the helical actin strands. B) active sites on the myosin are exposed. C) troponin shifts to expose the active sites on actin. D) muscle relaxation occurs. E) myosin shortens.
Axons are found in the __________ region of a neuron
A) Signal reception B) Signal integration C) Signal conduction D) Signal transmission Fill in the blank with the correct answer.