The smallest functional unit in the human body from a physiologic perspective is the:
a. nucleus
b. atom
c. cell
d. tissue
C
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During pulmonary ventilation, relaxation of the diaphragm and external intercostals ________ and air flows out of the lungs.
A. stimulates the phrenic nerve B. expands the rib cage C. increases the volume of the thoracic cavity D. flattens the floor of the thoracic cavity E. increases the pressure in the thoracic cavity
Bladder fullness is to ________ as blood pH is to ________
A) nociceptors; thermoreceptors B) baroreceptors; chemoreceptors C) baroreceptors; nociceptors D) chemoreceptors; nociceptors E) baroreceptors; thermoreceptors
In people who work during the day, cortisol levels in the plasma are normally higher in the morning than at night
Indicate whether the statement is true or false
What action causes the first heart sound heard through a stethoscope?
A) Opening of the semilunar valves B) Closing of the atrioventricular valves C) Closing of the semilunar valves D) Opening of the atrioventricular valves