circulatory system

4 Main Components

Heart, Blood, Blood vessels, lungs

Heart

pear-shaped muscular organ responsible for pumping blood through the blood vessels by rhythmic contraction

Heart contracts

approx. 65X/minute

Pulmonary circulation

pumps blood from the right side of the heart to the lungs

Systemic circulation

oxygenated blood is pumped from the left side of the heart to the rest of the body

Superior and inferior vena cava

- large veins that bring oxygen-poor blood into the heart

Right atrium

- upper right chamber of the heart

Tricuspid valve

- prevents blood from flowing back into the right atrium after it has entered the right ventricle

Right ventricle

- lower right chamber of the heart

Pulmonary valve

- prevents blood from flowing back into the right ventricle after it has entered the pulmonary artery

*Pulmonary artery

brings oxygen-poor blood to the lungs

*Pulmonary vein -

brings oxygen-rich blood from the lungs to the left atrium

Left atrium

upper left chamber of the heart

Bicuspid (mitral) valve

prevents blood from flowing back into the left atrium after it has entered the left ventricle

Left ventricle

lower left chamber of the heart

Aortic valve

prevents blood from flowing back into the left ventricle after it has entered the aorta