Roughly the size of a clenched fist, this is a major organ of the circulatory system. It has two pumps and acts like a muscular pump. Blood completes a cycle every 4 minutes so they're starved of oxygen by this time.
superior vena cava 1
Carries deoxygenated blood from the upper body to the heart through the right atrium.
inferior vena cava 1
Carries deoxygenated blood from the lower body to the heart through the right atrium.
right atrium 2
The chamber of the heart where deoxygenated blood is received from the superior and inferior vena cava and then sent to the right ventricle.
right ventricle 3
The chamber of the heart that receives deoxygenated blood from the right atrium and pumps it into the pulmonary artery.
left atrium 7
The chamber that receives oxygenated blood from the lungs from the pulmonary veins and sends it to the left ventricle.
left ventricle 8
The chamber of the heart that receives oxygenated blood from the left atrium and pumps it into the aorta.
pulmonary artery 4
Carries deoxygenated blood from the right ventricle to the lungs.
Exchange carbon dioxide (CO2) for new oxygen.
pulmonary veins 6
A vessel that carries oxygen-rich blood from the lungs to the left atrium.
The large arterial trunk that carries blood from the heart to be distributed by branch arteries through the body.
The physical structure of a person in which blood is pumped around.
A valve positioned between the right ventricle and the pulmonary artery to stop the blood flowing in the opposite direction.
A valve that is situated at the opening of the right atrium of the heart into the right ventricle to stop the blood flowing in the opposite direction.
A valve in the heart that guards the opening between the left atrium and the left ventricle; prevents the blood in the ventricle from returning to the atrium. Alternative name is bicuspid valve.
The valve separating the aorta from the left ventricle that prevents blood from flowing back into the left ventricle.