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❤️ How does the heart pump blood?

Two pumps in one organ: electrical timing, valves, and dual circuits move blood without pause.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

A pump with two jobsDescribe dual circulation, chambers, and valves as one-way plumbing.Right heart–lung and left heart–body loops run in series through one organ. Chambers specialize; valves prevent reverse flow.
Electricity before squeezeLink pacemaker conduction and calcium-driven contraction to the pulse.The SA node starts an electrical wave that times chamber contraction. Nerves and hormones retune rate. Electricity precedes useful squeeze.
Pressure, pulse, and coronary supplyExplain pulse pressure, coronary perfusion, and cardiac output levers.Arterial elasticity carries the pulse. Coronary arteries feed the pump itself. Output is heart rate times stroke volume.

Questions this course answers

Match each side of the heart to its main job

Right side serves lungs; left side serves systemic circulation; valves enforce direction; atria are the receiving chambers.

Order the usual electrical path of a heartbeat

Pacemaker first, atrial activation, AV delay, then ventricular contraction that produces the pulse.

Why does the heart need coronary arteries if it is full of blood?

The myocardium is fed by coronary arterial blood; blood inside the chambers does not substitute for that dedicated supply, especially in thick walls.

Grounded in trusted sources

Gray’s Anatomy / standard medical physiology texts on cardiac cycle
American Heart Association educational pages on how the heart works
NIH / NHLBI heart anatomy and blood flow explainers
Guyton and Hall Textbook of Medical Physiology — cardiac output chapters

Every Wunder lesson is built from real, reputable sources — never invented.

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