During ventricular systole, what occurs when the pressure in the left ventricle rises above that in the left atrium?
a. the left AV valve closes
b. the left AV valve opens
c. the aortic valve closes
d. all the valves close
Ans: a. the left AV valve closes
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Serotonin
A. is a catecholamine neurotransmitter. B. acts as a neuromodulator. C. has an inhibitory effect on pathways that are involved in the control of muscles. D. has an excitatory effect on pathways that mediate sensations. E. is a neuropeptide.
According to ____________________ law, at any constant temperature, the pressure of a gas varies inversely with the volume of the gas
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Which cells of the distal tubule secrete a paracrine in response to changes in the filtrate flow rate?
A) endothelial cells B) macula densa cells C) podocytes D) granular cells E) mesangial cells
The two parts of the nephron are the renal ________ and the renal ________
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