The purpose of the fluid in the pleural cavity is to __________.
a. provide lubrication for diaphragmatic constriction
b. allow for the exchange of electrolytes during respiratory movements
c. reduce friction between the parietal and visceral pleura
d. provide a medium for the exchange of O2 and CO2
Answer: c. reduce friction between the parietal and visceral pleura
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Which of the following movements is a good example of depression?
A) opening the mouth B) turning the hand palm upward C) extreme bending of the head backwards D) moving the hand toward the shoulder E) spreading the fingers
Olfactory receptor cells differ from all other receptors for special senses in that they ________
A) detect chemicals B) are of epithelial origin C) are neurons D) have hairs
Which of the following is NOT a muscle of the rotator cuff?
A) subscapularis B) teres minor C) supraspinatus D) teres major
Which is TRUE about the initial segment of an axon?
A. Its membrane potential at threshold is more positive than that of the cell body and dendrites. B. Its membrane potential at threshold is more negative than that of the cell body and dendrites. C. Synapses far from the initial segment are more effective in influencing whether an action potential will be generated in the axon than are synapses close to the initial segment. D. It is the region where neurotransmitter vesicles are docked and ready to be released by exocytosis. E. It can only conduct graded potentials because it lacks voltage-gated Na+ channels.