What organ pumps blood around the body?
The heart.
Name the three main types of blood vessels.
Arteries, veins, and capillaries.
Which blood vessel carries blood back to the heart?
Veins.
Which blood vessel is very thin and allows exchange of oxygen and carbon dioxide?
Capillaries.
What is a pulse?
The pressure wave in arteries when the heart pumps blood.
What is heartbeat?
The contraction and relaxation of the heart muscle.
What part of the blood helps fight infection?
White blood cells.
What part of the blood helps to stop bleeding by clotting?
Platelets.
What is plasma mostly made of?
Water.
Name one waste product carried by the blood.
Carbon dioxide.
