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