Excretion Quiz

Excretes carbon dioxide and water vapor in exhaled air

• Lungs

• Kidneys

• Skin

Excretes water, salts, small amounts of nitrogen wastes, and other substances in sweat

• Skin

• Kidneys

• Lungs

The liver plays a role in excretion because it converts ammonia, a toxic nitrogen-containing waste, to __________, which is a much less toxic waste

• urea

• nephrons

Excretes nitrogen wastes, salts, water, and other substances in urine

• Kidneys

• Lungs

• Skin

The Kidneys are important in regulating the amount of water and __________ in blood plasma.

• salts

• urine

The tube-like structures in the kidneys that filter wastes from the body and retain useful molecules are

called __________

• nephrons

• urea

The nephrons perform what 3 functions

• filtering the blood

• retaining useful molecules

• producing urine

• storing urine

The water, urea, and various salts that are left after re-absorption and secretion in the nephrons together make up __________

• urine

• salts

Urine is normally composed of what 3 things

• water

• urea

• salts

• blood

The ducts that carry urine away from the kidneys to the urinary bladder are called __________

• ureters

• incontinence