Biology Practice Test – Excretory Systems and Mechanisms (Questions with Answers and Explanations)

The blood vessels in the cavity of the Bowman’s capsule are collectively known as _____

A. renal veins.
B. renal arteries.
C. glomerulus.
D. renal capillaries.

The human kidney contains more than _______

A. one thousand nephrons.
B. one billion nephrons.
C. two million nephrons.
D. one million nephrons.

The Bowman’s capsule is located in the ____

A. glomerulus.    B. medulla.    C. cortex.    D. pelvis.

The actual concentration of urine takes place in the _______

A. loop of Henle.
B. collecting duct.
C. proximal convoluted tubule.
D. distal convoluted tubule.

Every mammal has ______

A. two pairs of kidneys.
B. one kidney.
C. one pair of kidneys.
D. none of the above.