Which vitamin begins its synthesis in the skin exposed to ultraviolet light?
A. vitamin C
B. vitamin E
C. vitamin B
D. vitamin D
E. vitamin A
D
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Which of the choices below is the parent cell for all formed elements of blood?
A) megakaryocyte B) NK cell C) pluripotent stem cell (hemocytoblast) D) polymorphonuclear cell
Where are follicles located?
A. Medulla of the ovary B. Cortex of the ovary C. Center of the ovum D. Epithelium of the endometrium E. Epithelium of the placenta
Blood is returned to the heart via the _________.
A. superior vena cava B. inferior vena cava C. coronary sinus D. all of the above
Pulsate secretion of growth hormone is descriptive of or occurs during
A. slow-wave sleep. B. paradoxical sleep. C. both slow-wave sleep and paradoxical sleep. D. neither slow-wave sleep nor paradoxical sleep.