Excretory System

Which organ of the excretory system stores urine until the body is ready to eliminate it?

• ureters
• urethra
• urinary bladder
• urea

What is the main function of the excretory system?

• to collect and remove wastes from the body
• to strengthen skeletal muscles
• to protect the nervous system
• to bring oxygen to body cells

Which excretory organ eliminates water and some chemical wastes in perspiration?

• lungs
• skin
• liver
• kidneys

What function do the kidneys perform?

• eliminate carbon dioxide
• supply oxygen to body cells
• remove urea and excess water
• play a role in gas exchange

These organs are responsible for what?

• storing urine
• storing water
• filtering blood
• they don't have a particular job 

Organs of excretion that maintain homeostasis include the kidneys, lungs, skin, and

• bronchus.
• diaphragm.
• bladder.
• liver.

The excretory system is responsible for moving toxic wastes, dissolved molecules, and excess heat. You would conclude that the excretory system contributes to

• circulating molecules around the body
• maintaining dynamic equilibrium in the body
• producing egg and sperm cells in the body
• gas exchange

Which organ converts toxic ammonia (a by-product of protein metabolism) into urea?

• liver

• kidneys

• urinary bladder

What is the main function of a nephron?

• It breaks down red blood cells to form nitrogenous wastes.
• It regulates the chemical composition of the blood.
•  It forms urea from the waste products of protein metabolism.
• It absorbs digested food from the contents of the small intestine.
  

Which of these activities is NOT related to the excretory system?

• Filtering the blood to remove unwanted waste.

• Moving urine from the kidneys to the bladder.

• Creating urine within the small intestine.

• Removing urine from the bladder through the urethra.