Contraction of the papillary muscles would
A. prevent the AV valves from protruding into the atria.
B. open the semilunar valves.
C. eject blood from the ventricles.
D. close the semilunar valves.
E. cause the atria to eject their contents into the ventricles.
Answer: A
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After embryonic folding, the _____ sac becomes reduced in size and eventually gives rise to the first blood cells and stem cells that give rise to gametes.
Fill in the blank(s) with the appropriate word(s).
Damage of the sensory and motor roots on one side would result in loss:
A. on neither side B. on the same side in the area served by the spinal nerve only C. on the opposiste side in the area served by the spinal nerve only D. on the same side below the level damaged in the spinal cord E. on the opposite side below the level damaged in the spinal cord
Sperm from the male parent determines the sex of the child
Indicate whether the statement is true or false
Answer the following statements true (T) or false (F)
1. The hormone oxytocin produces its effects on only about half the population. 2. The hypothalamus produces only two hormones, ADH and oxytocin. 3. The hypothalamus produces only two hormones with target organs outside the head, ADH and oxytocin. 4. The target cells for T4 are virtually all cells in the body. 5. The target cells for aldosterone are in the liver.