The end of the aorta occurs when the vessel bifurcates into the
A. brachiocephalic artery.
B. subclavian arteries.
C. common carotid arteries.
D. common iliac arteries.
Answer: D
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Preganglionic axons of the ANS release
A. acetylcholine. B. norepinephrine. C. either acetylcholine or norepinephrine.
The last step to synthesis of 1,25-dihydroxy vitamin D3 occurs in what organ?
A) skin B) brain C) gastrointestinal tract D) kidney E) liver
_________ are small channels that allow materials to pass from one epithelial cell to another.
A) Tight junctions B) Gap junctions C) Desmosomes D) Hemidesmosomes
A stimulus traveling toward a synapse appears to open calcium ion channels at the presynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal membrane
Indicate whether the statement is true or false