Key Ideas Video: The Circulatory & Respiratory System

What is the main function of the circulatory system?

• To digest food

• To help us breathe

• To deliver nutrients and oxygen to the body

• To produce energy

What do white blood cells do?

• They produce energy

• They carry oxygen

• They fight off diseases

• They digest food

How does oxygen get into our blood?

• By eating food

• Through the lungs

• Through our skin

• By drinking water

What happens to carbon dioxide in our body?

• It is stored in the muscles

• It is turned into oxygen

• It is expelled when we breathe out

• It is absorbed by the skin

Why is it important to keep our circulatory and respiratory systems healthy?

• To make us taller

• To help us sleep better

• To ensure our body can transport nutrients and oxygen effectively

• To improve our eyesight