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Circulatory system
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What is the function of plasma in the blood?
To carry nutrients, hormones, and waste products.
What is the main function of red blood cells?
To carry oxygen around the body.
What are the four main components of blood?
Plasma, red blood cells, white blood cells, and platelets.
Why are valves in veins important?
They stop blood from flowing backwards.
What happens to carbon dioxide in the blood when it reaches the lungs?
It diffuses into the air sacs and is breathed out.
Name one waste product carried by the blood.
Carbon dioxide.
What is plasma mostly made of?
Water.
What part of the blood helps to stop bleeding by clotting?
Platelets.
What part of the blood helps fight infection?
White blood cells.
Which side of the heart pumps blood to the rest of the body?
The left side.
Which side of the heart pumps blood to the lungs?
The right side.
What is heartbeat?
The contraction and relaxation of the heart muscle.
What is a pulse?
The pressure wave in arteries when the heart pumps blood.
What does the heart do when it contracts?
It pumps blood out.
Which blood vessel is very thin and allows exchange of oxygen and carbon dioxide?
Capillaries.
Which blood vessel carries blood back to the heart?
Veins.
Which blood vessel carries blood away from the heart?
Arteries.
Name the three main types of blood vessels.
Arteries, veins, and capillaries.
What organ pumps blood around the body?
The heart.
What is the main function of the circulatory system?
To transport oxygen, nutrients, and waste products around the body.