Heart — Tashrih

Step 1

Choose an organ

Step 2

Aorta: Main artery
Pulmonary Trunk: Carries venous blood to the lungs
Superior Vena Cava: Returns blood from head and arms
Inferior Vena Cava: Returns blood from the abdomen and legs
Left Atrium: Receives oxygenated blood
Right Atrium: Receives venous blood
Sinoatrial Node: The pacemaker — sets the rhythm itself
Atrioventricular Node: The only electrical door between atria and ventricles, and it deliberately delays every signal it passes
Left Ventricle: Pumps to the body
Right Ventricle: Pumps to the lungs
Mitral Valve: Guards the exit of the left atrium and stops blood flowing back into it
Tricuspid Valve: Guards the right atrium's outflow
Aortic Valve: Three cupped leaflets at the aorta's mouth; the coronary arteries leave from two of them
Pulmonary Valve: Shuts the pulmonary trunk the instant the right ventricle relaxes — the second heart sound, right half
Anterior Interventricular Artery: The LAD, running the front groove between the ventricles; it feeds the septum and the left ventricle's front wall
Right Coronary Artery: Circles in the right coronary sulcus and supplies the sinoatrial node in most hearts
Coronary Sinus: The heart's own vein, collecting spent blood at the back and emptying straight into the right atrium
Apex: The tip, where the beat is felt on the chest wall

Step 3

Microscopic view

Compare organs

Function animation

Clinical notes

Crushing central chest pain spreading to the jaw or left arm — treated as a heart attack until proven otherwise.
Fainting during exertion suggests the outflow is obstructed — aortic stenosis or an arrhythmia, never dismissed.
Breathlessness on lying flat that eases on sitting up is the failing left heart flooding the lungs.

Where it works

A closed loop of pump and pipework that carries oxygen, fuel, heat, and signals to every living cell.