What does the heart do?
It pumps blood.
Blood vessels are separated into veins and arteries. Which ones are blue and which ones are red?
Veins are blue and arteries are red
What is the avarage size of the heart?
The size of a person's fist.
What is the name of the tubes that carry blood in the circulatory system?
Blood vessels
What happens to your heart when you practice exercise?
It pumps blood faster.
What does the bladder do?
It stores urine
It is common to say that the kidneys have the same shape of...?
Beans
True or false: a person can survive with just one kidney.
True.
What is the main organ of the circulatory system?
The heart
What are the main organs of the excretory system?
The kidneys