The major source of estradiol and progesterone in a non-pregnant woman is the:
A. thyroid gland.
B. adrenal gland.
C. testis.
D. ovary.
E. uterus.
D
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Which of the following is characteristic of cardiac muscle tissue?
A) cells have many, irregularly shaped nuclei B) is the only nonstriated muscle tissue C) contracts only with nervous stimulation D) composed of small cells with branching ends E) can replace cells and regenerate after an injury
The synthesis of ________ depends on the penetration of ultraviolet light through the epidermis.
A. vitamin D B. keratin C. carotene D. collagen E. cholesterol
The organ that monitors and adjusts the composition of tubular fluid, recycles damaged sperm, and is the site of sperm maturation is the
A) ductus deferens. B) rete testis. C) seminal gland (seminal vesicle). D) epididymis. E) prostate gland.
Which of the following indicates the direction of diffusion of gases at the alveoli of the lungs?
a) Oxygen into blood, Carbon dioxide into blood b) Oxygen out of blood, Carbon dioxide into blood c) Oxygen into blood, Carbon dioxide out of blood d) Oxygen out of blood, Carbon dioxide out of blood