The myelin sheaths of PNS neurons are produced by _____
Fill in the blank(s) with the appropriate word(s).
schwann cells
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The AV node is important because it
A) delays the transmission of the electrical impulses to the ventricles in order for the atria to finish contracting. B) directs electrical impulses from the ventricles to the atria. C) serves as the pacemaker in a normal heart. D) electrically opens the AV valves. E) None of these answers are correct.
The ________ gland is often referred to as the master gland of the endocrine system.
Fill in the blank(s) with correct word
Select the correct statement about blood flow
A) It is relatively constant through all body organs. B) Blood flow through the entire vascular system is proportional to cardiac output. C) It is measured in mm Hg. D) It is greatest where resistance is highest.
In dehydration:
a. intercellular fluid volume drops first b. plasma volume drops first c. interstitial fluid drops first d. neither interstitial nor intracellular fluid volume are affected