Vertebrate blood vessels have complex walls. The smooth muscle of the __________ layer of the blood vessel causes vasoconstriction
Fill in the blank with the correct word.
Answer: Tunica media
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The number of bones in the axial skeleton in an adult is
A. 60. B. 70. C. 80. D. 100.
Which cell type does not release acetylcholine as its primary neurotransmitter?
a. sympathetic preganglionic b. sympathetic postganglionic c. parasympathetic preganglionic d. sympathetic postganglionic e. alpha motor neurons
Blood returning to the heart from the systemic circuit first enters the
A) right atrium.
B) right ventricle.
C) left atrium.
D) left ventricle.
E) conus arteriosus.
Onset of labor may result from
A. increased secretion of oxytocin by the fetus. B. increased glucocorticoid secretion by the mother. C. increased progesterone secretion by the placenta. D. increased estrogen secretion by the placenta. E. decreased prostaglandins.