Depolarization of neurons results from the entry of sodium ions into the cell
Indicate whether the statement is true or false
TRUE
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The glossy-white appearance of most axons is due to
A. the white color of the perivascular feet. B. their proximity to white bone. C. the covering of ependymal cells. D. their proximity to light-reflecting cartilage. E. the high lipid content of the myelin sheath.
Chemicals that help keep body fluids within a normal pH range are called
A. salts. B. bases. C. acids. D. buffers.
Which of the choices below does not describe the importance of tubular secretion?
A) disposing of substances not already in the filtrate, such as certain drugs B) eliminating undesirable substances such as urea and uric acid that have been reabsorbed by passive processes C) ridding the body of bicarbonate ions D) ridding the body of excessive potassium ions
What is an important by-product of exergonic reactions?
A) water B) carbon dioxide C) oxygen D) polymers E) heat