Heart
A muscular organ with a left and right side, divided by the septum, responsible for pumping blood throughout the body.
Septum
The wall that divides the left and right sides of the heart.
Atrium
The two upper chambers of the heart that receive blood from the circulatory system.
Ventricle
The lower chambers of the heart that pump blood out of the heart.
Valves
Structures in the heart that prevent blood from flowing backwards, similar to veins.
Deoxygenated Blood
Blood that has low oxygen content, entering the right atrium from the body through the vena cava.
Vena Cava
A type of vein that carries deoxygenated blood from the body to the right atrium.
Pulmonary Artery
The vessel that carries deoxygenated blood from the right ventricle to the lungs for oxygenation.
Oxygenated Blood
Blood that has high oxygen content, entering the left atrium from the lungs through the pulmonary vein.
Pulmonary Vein
The vessel that carries oxygenated blood from the lungs to the left atrium.
Aorta
The main artery that carries oxygenated blood from the left ventricle to the rest of the body.
Pacemaker
Specialized cells in the wall of the right atrium that regulate the heart's contraction by sending electrical impulses.
Natural Resting Heart Rate
The normal rate at which the heart beats, controlled by the pacemaker cells.
Faulty Pacemakers
Malfunctioning pacemaker cells that can lead to an irregular heartbeat.
Artificial Pacemaker
A device implanted under the skin that sends electrical currents to the heart to regulate its beating.