Central chemoreceptors are most sensitive to changes in __________.
a) PCO2
b) PO2
c) hydrogen ion concentration
d) hemoglobin concentration
Answer: a) PCO2
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Which organ contains 95 percent of the neural tissue in the body?
A) brain B) nerves C) spinal cord D) thalamus E) None of the answers are correct.
A pH of 4 is ____ times as acidic as a pH of 7
a. 10 b. 100 c. 1,000 d. 10,000 e. 100,000
What follows immediately after fertilization occurs?
A) cleavage B) sperm migration C) acrosomal reaction D) capacitation
How does distribution of symapthetic nerves differ from the distribution of parasymapthetic nerves?
A. Only the sympathetic division serves the head and neck. B. Only parasympathetic nerves innervate the thoracic region. C. Sympathetic fibers innervate the abdominal cavity, while parasympathetic fibers innervate the pelvic region. D. Spinal nerves contain sympathetic fibers, while cranial nerves contain parasympathetic fibers.