Question
red.
The filtrate travels through the renal
tubule and useful substances are
reabsorbed into the blood.
Nephron tubules secrete waste
products into collecting tubules.
Blood enters the kidneys through
the renal artery and branches to
reach the glomerulus.
31
Answer
The glomerulus filters the blood and the nephron tubules secrete waste products into collecting tubules, while useful substances are reabsorbed into the blood.