Which sex chromosome(s) is(are) needed for life?
A. X
B. Y
C. X and Y
Answer: A
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Which of the following is the dominant method of carbon dioxide transport?
a) Bound to hemoglobin b) Bound to oxygen c) Dissolved in plasma as a gas d) Dissolved in plasma as bicarbonate ions e) Diffusion
Under normal circumstances, which passageway is capable of conducting air, food, or liquid?
A. Nasopharynx B. Laryngopharynx C. Glottis D. Larynx E. Trachea
Which of the following statements accurately describe events that occur as a result of a local potential reaching threshold?
A. Activation gates of Na+ ion channels begin to close. B. Inactivation gates of Na+ ion channels begin to open. C. A positive feedback cycle develops in which depolarization causes activation gates of Na+ ion channels to open. D. K+ ion channels begin to close. E. Inactivation gates of Na+ ion channels begin to open and a positive feedback cycle develops in which depolarization causes activation gates of Na+ ion channels to open.
Aldosterone stimulates the reabsorption of Na+ and secretion of K+ by the ________.
A. distal convoluted tubules B. proximal convoluted tubules C. nephron loops D. proximal and distal convoluted tubules