One of the main functions of the respiratory system is to get rid of carbon dioxide after it bring which gas into the body?

Oxygen enters the body through which two body parts?

What is the major organ of the respiratory system?

What is the scientific term for windpipe?

What are the tubes called that branch out from the trachea?

In the lungs the bronchi branch out into small tubes which turn into tiny air sacs called what?

What are alveoli surrounded by?

What is picked up by the capillaries in the alveoli?

What is taken from the blood by capillaries in the alveoli?

As your body takes in substances, it uses what it needs, the rest is what?

The body's way of keeping the internal environment stable despite the changes happening outside of the body is called what?

The lungs, kidneys, liver, ureters, bladder, urethra, and skin make up which body system?

What are the main wastes that the body gets rid of through the excretory system?

What is the waste that your lungs get rid of?

What is the process of breathing in oxygen and getting rid of carbon dioxide called?

Most of our body's what is excreted by the skin?

What chemical comes from the breaking down of proteins in the body?

Urine is excreted from what organ?

The liver is considered what type of organ as it relates to the excretory system?