Cells that form a myelin sheath in the CNS are called __________.
Fill in the blank(s) with the appropriate word(s).
oligodendrocytes
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As the total cross-sectional area of the vascular tree ____, the velocity of blood flow ____
a. increases; decreases b. increases; increases c. decreases; decreases d. increases; remains constant e. decreases; remains constant
Type II diabetes is characterized by
A) a lack of response by target cells to insulin. B) a decrease in secretion by pancreatic beta cells. C) excessive secretion of glucagon. D) inadequate insulin production. E) low blood-glucose concentration.
Spongy bone consists of a meshwork of interconnecting sections of bone called ____________________
Fill in the blank(s) with correct word
Which of the following events would cause the gap junctions between cardiac cells to close?
a. ischemia b. atrial fibrillation c. premature ventricular contractions (PVCs) d. arrhythmia