In males and females, the process of arousal is under the control of
A) the parasympathetic nervous system.
B) the sympathetic nervous system.
C) both the parasympathetic and sympathetic nervous systems.
D) the central and sympathetic nervous systems.
E) the central nervous system only.
A) the parasympathetic nervous system.
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Answer the following statement true (T) or false (F)
During the fetal period, there is an opening between the right and left atrium called the __________ __________.
Fill in the blank(s) with the appropriate word(s).
How does lung perfusion work in ventilation-perfusion coupling?
A. Alveolar capillaries constrict where the partial pressure of oxygen is low, so blood is diverted to where the partial pressure of oxygen is high. B. If partial pressure of carbon dioxide increases, the bronchioles dilate. C. Air flow is directed to lobules where partial pressure of carbon dioxide is high. D. If partial pressure of carbon dioxide decreases, the bronchioles constrict.
Substrate molecules bind to enzymes at the ________ sites
A) amino B) active C) carboxyl D) reactant E) neutral