17. Which of the following happens first as a nephron processes blood?

A. reabsorption

B. excretion

C. osmosis

D. filtration

E. secretion

Answer: filtration

Explanation:

this process allows water and small molecules to filter out of the plasma of the blood.

Answer: Option D) Filtration

Explanation:

Blood brought to the kidney by renal artery. As it circulates through the capillaries of glomerulus of each bowman's capsule, water, urea, nitrogenous compounds, glucose etc are filtered into the capsule. This process of filtering materials from the glomerulus into the bowman's capsule is called ultra filtration