Which of the following is not a role of calcium in the body?
A. It is important in blood clotting.
B. It participates in muscle contraction.
C. It is a significant component of nucleic acids.
D. They serve as second messengers.
E. It activates exocytosis.
Answer: C
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Action potentials in the heart spread from cell to cell through
A. gap junctions. B. valves. C. interneurons. D. coronary vessels. E. desmosomes.
Na+ has the greatest influence on resting membrane potential due to its high permeability in the membrane.
a. true b. false
Prostaglandins are secreted in high concentration into semen by the prostate gland
Indicate whether the statement is true or false.
The pulmonary trunk divides into the
A. pulmonary veins. B. pulmonary arteries. C. right and left primary bronchi. D. right and left brachiocephalic veins.