wunder beta

📘 How the heart pumps blood

Follow chambers, valves, pressure gradients, electrical timing, and the two circulation loops.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

Start the course →

What you’ll learn

Four chambers
Valves
Electrical trigger
Filling
Ventricular systole
Pulmonary circuit
Systemic circuit
Pressure
Electrical record
Output

Questions this course answers

What does the right ventricle pump?

The right ventricle drives the pulmonary circuit.

How do valves open?

Valve motion follows pressure gradients.

What starts a normal heartbeat?

Pacemaker cells in the SA node initiate the signal.

Why is the left ventricle thicker?

Systemic circulation requires higher pressure than pulmonary circulation.

What does an ECG primarily record?

An ECG detects electrical activity and its sequence.

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