The blood vessel carrying deoxygenated blood from the heart to the lungs
The large, lower right chamber of the heart which pumps deoxygenated blood to the lungs
The natural pacemaker region of the heart
The blood vessel carrying oxygenated blood from the lungs back to the heart
The large, lower left chamber of the heart which pumps oxygenated blood around the body
The upper right chamber of the heart which receives deoxygenated blood from the body
The upper left chamber of the heart which receives oxygenated blood from the lungs
The major vein bringing deoxygenated blood back from the body to the heart.
The stage when the heart is relaxed and filling with blood
The stage when the heart contracts and pumps out blood
The name for a group of cells that are developing into a fetus. In humans this is from implantation to the 8th week of development
The major artery taking oxygenated blood from the heart around the body
The heart is divided into two pumps. Deoxygenated blood from the body enters the right atrium through the vena cava.
Oxygenated blood from the lungs enters the left atrium in the pulmonary vein at the same time.
The atria contract together and force the blood down into the ventricles. Valves close so that blood does not flow backwards.
When the ventricles have filled with blood they contract. The right ventricle forces deoxygenated blood to the lungs in the pulmonary artery. The left ventricle pumps oxygenated blood out of the heart and around the body in the aorta. Valves close to stop blood flowing back into the heart.
The blood from the two sides of the heart never normally mixes.
The beating of the heart
The pacemaker of the heart in action
The response of the heart to exercise