The vertical osmotic gradient in the kidney
a. is established and maintained by the countercurrent system
b. makes it possible to put out urine of variable concentration depending on the needs of the body by varying the degree of water permeability of the distal portions of the nephron
c. is found in the renal cortex
d. has characteristics a and b
e. has characteristics a and c
D
You might also like to view...
Hyp/o- means "above normal."
Answer the following statement true (T) or false (F)
Which hormone group is not secreted by the adrenal cortex?
A. Mineralocorticoids B. Glucocorticoids C. Corticosteroids D. Gonadocorticoids E. All of the choices are correct.
Tubular reabsorption involves all of the following except
A) active transport. B) facilitated diffusion. C) cotransport. D) countertransport. E) stem cell movements.
A particularly rich plexus of veins is present in the connective tissue of which respiratory struc-ture?
a. Bronchiole b. Larynx c. Nasal concha d. Olfactory epithelium of the anterior nasal cavity e. Primary bronchus