Which of the following types of glial cells connect neurons to blood vessels, helps form the blood-brain barrier, and assists in the regulation of oxygen, carbon dioxide, and nutrients?
A) ependymal cells
B) astrocytes
C) Schwann cells
D) microglia
B
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Motor pathways are formed from a series of connections. Which is not part of the series?
A. Motor neurons B. Hypothalamus C. Cerebellum D. Descending projection tracts E. Cerebral nuclei
When the aortic semilunar valve closes and blood bounces off of it, it produces the ________ heart sound that is ultimately related to when the ________.
A. dupp (S2); ventricles relax B. lubb (S1); ventricles relax C. lubb (S1); ventricles contract D. dupp (S2); atria relax E. lubb (S1); atria contract
A change in resting membrane potential confined to a small area is called a(n)
A. local potential. B. action potential. C. summated potential. D. after potential. E. resting membrane potential.
A muscle cell membrane is called the ________
A) perimysium B) endomysium C) sarcolemma D) epimysium