Pathway of blood flow through heart

1. Right atrium (deoxygenated blood)

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2. Right ventricle

3. Pulmonary trunk and pulmonary arteries

4. In pulmonary capillaries, blood loses CO2 and gains CO2

5. Pulmonary veins (oxygenated blood)

6. Left atrium

7 left ventricle

8 aorta and systemic arteries

9 in systemic capillaries, blood loses O2 and gains CO2

Aortic valve

Bicuspid valve

Coronary sinus

Inferior vena cava

Pulmonary valve

Superior vena cava

Tricuspid valve