What is the function of circulatory system?

What are the main organs of the circulatory system?

Which type of blood vessel carries blood with oxygen to the body?

Which type of blood vessel carries blood without oxygen back to the heart?

How many chambers are in the heart?

How many valves are in the heart?

What are the chambers of the heart called?

Which part of the blood fights germs and infection?

Which part of the blood carries oxygen in hemoglobin?

Which part of the blood sticks together to stop bleeding and becomes a scab?

What is the purpose of valves in the heart?

How much blood is an adult human body?

How big is the heart?

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