The Circulatory System - by Sean Evans

The circulatory system is made up of the vessels and the muscles that help and control the flow of the blood around the body.


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The Heart: About the size of two adult hands held together, the heart sits near the center of the chest. The heart consistently pumps to keep the circulatory moving.

Arteries: Arteries carry blood rich in oxygen away from the heart and where they need to go.


: Veins carry blood to the lungs to receive oxygen.


: Blood is the carrier of nearly everything for the body. It transports hormones, nutrients, oxygen, antibodies, and other important things needed to keep the body healthy.


Epinephrine: this hormone increases heart rate and lets the heart pump blood faster.

Norepinephrine: Increases heart rate and blood flow.

Brain Natriuretic Peptide:Decreases blood pressure.

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Insulin: regulates blood sugar levels.

Acetylcholine: slows heart rate.

Renin: Increases blood pressure.


The Circulatory system help regulates using three types of circulation.

- Pulmonary Circulation which carries blood from the heart to gather oxygen from the lungs.

- Systemic Circulation which carries blood blood with oxygen to other parts of the body.

- Coronary Circulation which provides the heart with blood.