The adrenal medulla synthesizes catecholamines. The first enzyme in the catecholamine synthesis pathway enzyme, tyrosine hydroxylase, is stimulated by:
A. cortisol
B. epinephrine
C. norepinephrine
D. acetylcholine
E. nitric oxide
ANS: D
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Determine the series of hormonal events that leads to birth
1. Oxytocin stimulates the placenta to secrete prostaglandins. 2. Fetal cortisol stimulates the placenta to secrete estrogen. 3. Prostaglandins dilate the cervix, and with oxytocin, increase the strength of uterine contractions. 4. The high estrogen level stimulates the uterus to form oxytocin receptors. A) 1, 3, 2, 4 B) 1, 4, 2, 3 C) 2, 4, 1, 3 D) 2, 4, 3, 1
The approximate number of red blood cells in a cubic millimeter of blood is:
a. 50,000 b. 500,000 c. 5,000,000 d. 50,000,000
Which of the following binds to the active site of an enzyme?
water product substrate any other enzyme None of the choices are correct.
The endosteal layer of the dura mater acts as the periosteum of the ____________________ and the ____________________.
Fill in the blank(s) with the appropriate word(s).