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

The human kidney contains more than _______

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

The major functions of the kidney are ______

A. deamination and detoxication.
B. excretion and osmoregulation.
C. transportation and osmoregulation.
D. deoxygenation and detoxication.

The functional units of the kidney are called ________

A. nephrons.     B. glomerulus.     C. urethra.    D. medulla.

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 function of conserving water is achieved in mammals by the ______

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