excretory system

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

• ureters
• urethra
• urinary bladder
• urea

Which excretory organ eliminates water and some chemical wastes through sweating?

• 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

The process of removal of the body’s wastes is called

• gas exchange.
• respiration.
• excretion.
• filtration.

How many kidneys do you have?

• 1
• 3
• 5
• 2

Which organ system removes cellular wastes as the result of cellular respiration?

• nervous
• digestive
• excretory
• circulatory

What is the function of the urethra?

• It filters urea out of the bloodstream
• It delivers urine from the bladder to the outside world
• It transfers urine from the kidneys to the bladder
• It prevents urine from leaking out of the bladder

Organ that holds urine until it leaves the body 

• Bladder
• Ureter
• Urethra

Gases are exchanged in the 

• bronchi
• alveoli
• windpipe
• diaphragm