Eventually, the placenta secretes the major hormones that regulate pregnancy. Until then, what is the main source of hormones?
A. The endometrium
B. The amnion
C. The pituitary
D. The corpus luteum
E. The umbilical cord
Answer: D
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Indicate whether the statement is true or false
When blood pH decreases, which of the following occurs to correct the imbalance?
A. Less CO2 is expelled from the lungs. B. The respiratory center increases the breathing rate. C. The carbonic acid/bicarbonate equation is driven to the right. D. The respiratory center decreases the breathing rate. E. More CO2 is expelled from the lungs.
Which part of the brain helps to regulate the ANS actions from the medulla during motion sickness?
A. Cerebrum B. Cerebellum C. Limbic system D. Hypothalamus
What accounts for the majority of bone (osseous) tissue matrix?
A) bone marrow B) osteoid C) calcium salts D) collagen fibers