02 The Excretory System

What is excretion?

• getting rid of waste materials made inside cells

• another term for aerobic respiration

• taking in food

• getting rid of undigested food

Another name for the human excretory system is the:

• digestive system

• circulatory system

• kidney system

• renal system

The main substance that kidneys remove from the blood is

• urine

• urea

• uranus

• urinol

What substance do human lungs excrete?

• oxygen

• carbon dioxide

• nitrogen

• urinol

The kidneys remove waste substances from the blood. Which part of the blood carries these waste substances?

• platelets

• red blood cells

• plasma

• blood vessels

Select the organs found in the human excretory system

• Bladder

• Kidney

• Liver

• Ureter

Select the route that urine takes from your kidneys and out of your body.

• urethra > bladder > ureters > kidney

• kidney > ureters > bladder > urethra

• kidney > urethra > bladder > ureters

• kidney > bladder > urethra > ureters

The excretory system is an example of an organ system. What is an organ system?

• group of organs that work together to perform a specific function

• group of similar cells with similar functions that work together

• group of tissues that work together to perform a specific function

• the smallest unit of a living organism

Describe how kidneys make urine?