Aorta: Largest systemic artery carrying oxygenated blood under high systolic pressure
Left Atrium: Receives oxygenated blood from 4 pulmonary veins
Right Atrium: Receives deoxygenated venous blood via Superior & Inferior Vena Cava
Left Ventricle: Thickest muscular chamber; pumps blood into systemic aorta
Right Ventricle: Pumps deoxygenated blood through pulmonary artery to lungs
Bicuspid / Mitral Valve: Two-cusp valve preventing ventricular backflow into left atrium

3D specimen · click a dot to exploreCor

The Heart

Heart

The tireless muscular pump

A hollow, muscular organ enclosed in a double-walled pericardium. It drives double circulation (pulmonary and systemic) to deliver oxygenated blood and nutrients to every cell while collecting metabolic wastes.

Key facts

◇ Size: About the size of a clenched fist (~12 × 9 cm)
♙ Weight: 250–350 g (larger in males)
⌁ Daily: Pumps ~7,000–8,000 Litres of blood in ~100,000 beats daily
⌖ Location: Thoracic cavity in mediastinum, tilted left behind sternum
❋ Blood supply: Left and right coronary arteries arising from the base of the ascending aorta
◈ Function: Drives double circulation & maintains blood pressure (~120/80 mmHg)

Medical importanceMyogenic rhythm originates at the Sinoatrial (SA) Node (natural pacemaker). Heart sounds S1 (Lub) and S2 (Dub) arise from closure of atrioventricular and semilunar valves.

Did you knowGenerates its own electrical impulses independently of the central nervous system and beats ~2.5 billion times in an average lifetime.

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Microscopic view

Cardiac muscle (Myocardium) with branching fibers and intercalated discs

Compare organs

Heart vs. brain

Function animation

Drives double circulation & maintains blood pressure (~120/80 mmHg)

Clinical notes

Common conditions

Coronary Artery Disease (Atherosclerosis)
Myocardial Infarction (Heart Attack)
Hypertension (High Blood Pressure > 140/90 mmHg)
Cardiac Arrhythmia & Fibrillation
Heart Valve Stenosis & Regurgitation
Congestive Heart Failure (CHF)
Pericarditis
Congenital Septal Defects (ASD / VSD)

Where it works