Hormones released into the interstitial fluid by the anterior pituitary enter the circulation easily because
A) they are brought through the choroid plexus by active transport.
B) they pass easily through the infundibulum.
C) a strong countercurrent mechanism maintains a concentration gradient that draws them in.
D) the adjacent capillaries are fenestrated to permit passage of large molecules into the circulation.
E) None of the answers are correct.
D) the adjacent capillaries are fenestrated to permit passage of large molecules into the circulation.
You might also like to view...
Renal compensation to a decrease in blood H+ levels is to increase the activity of type
A. A cells to secrete more bicarbonate. B. A cells to secrete less bicarbonate. C. B cells to secrete more bicarbonate. D. B cells to secrete less bicarbonate.
Which of the following vessels supplies 80% of the cerebrum with oxygenated blood?
A. Superficial temporal artery B. Occipital artery C. Internal carotid artery D. Anterior cerebral artery E. Middle cerebral artery
What contributes to the calculation of the mass number?
A) sum of electrons and neutrons B) sum of protons, neutrons, and electrons C) sum of protons and electrons D) sum of protons and neutrons
The major source of estradiol and progesterone in a non-pregnant woman is the
A. testis. B. uterus. C. ovary. D. adrenal gland. E. thyroid gland.