The Excretory System: Waste Not, Want Not

What is the main function of the excretory system?

• To excrete saliva

• Get rid of waste products from your cells

• Break down food for digestion

• Circulate oxygen

What is an example of a waste product?

• Extra water and salts

• Unhealthy foods

• Fruits and vegetables

• Pizza and lasagna

Which of the following is not an organ of the excretory system?

• Liver

• Kidney

• Skin

• Heart

When does skin take part in excretion?

• All the time

• Never

• When a person sweats

• When a person sleeps

What very important job do the kidneys have?

• To make urine

• To filter waste out of blood

• All of the above

• None of the above

If your urine is light or pale yellow, it means that:

• You are dehydrated

• You are hydrated

• You don't have enough yellow food dye in your diet

• You aren't getting enough sun

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

• Skin

• Liver

• Lungs

• Kidneys

The excretory system regulates the _____________ composition by removing wastes.

• Mechanical

• Chemical

• Toxic

• Blood

The removal of wastes in the body is known as ___________.

• Secretion

• Removal

• Subtraction

• Excretion

What job do the lungs perform in eliminating wastes from the body?

• Taking in oxygen

• Filtering blood

• Exhaling carbon dioxide (CO₂)

• Getting rid of waste