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❤️ How does the circulatory system work?

A dual pump drives blood through arteries, capillaries, and veins under regulated pressure for delivery and return.

lessons

~20 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

A closed loop under pressureDescribe closed circulation, dual circuits, and pressure-driven flow.Human circulation is a closed, pressurized network. Pulmonary and systemic loops share one heart. Flow follows pressure gradients.
The heart as a timed dual pumpExplain chambers, valves, conduction, and the cardiac cycle.Four chambers and valves enforce one-way dual pumping. Pacemaker cells time systole and diastole. Autonomic signals retune rate and force.
Arteries, capillaries, veinsMatch vessel types to pressure roles and exchange.Arteries distribute under pressure, capillaries exchange, veins return and store volume. Local control redistributes finite cardiac output.
What blood carriesIdentify plasma, red cells, white cells, platelets, and lymphatic partnership.Blood is multitasking cargo: plasma solvent, hemoglobin oxygen, immune and clotting cells. Lymphatics help with fluid return.
Control, exchange, and limitsConnect gas exchange, blood pressure regulation, and exercise responses.Lungs and tissues complete the purpose of flow. Pressure is regulated by neural and renal mechanisms. Exercise reveals the integrated system.

Questions this course answers

In mammals, which side of the heart pumps blood to the lungs?

The right ventricle drives pulmonary circulation; the left ventricle drives systemic circulation to the body.

Why does blood flow through the systemic arteries?

Bulk flow follows pressure gradients generated primarily by ventricular contraction.

What do heart valves primarily accomplish?

Valves prevent backflow so each contraction moves blood forward through the dual circuits.

Match each term to its meaning

Electrical timing triggers mechanical systole and diastole; surface electrodes capture the electrical pattern.

Where does most exchange of gases and nutrients with tissues occur?

Thin capillary walls and slow flow through extensive beds enable diffusion and filtration exchange.

Why do veins need valves and muscle pumps in the legs?

Without one-way valves and external compression, blood would pool more easily in dependent limbs.

Grounded in trusted sources

OpenStax Anatomy & Physiology — heart, vessels, blood, and circulatory regulation chapters
NIH / NHLBI public educational materials on the heart and blood vessels
American Heart Association patient education primers on circulation (overview level)
Grey's Anatomy / standard medical anatomy references for structural orientation (educational use)

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

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