Blood circulation through heart

Blood circulation through the heart is a continuous process that transports oxygen-rich blood from the lungs to the body and returns oxygen-poor blood back to the heart and lungs.

This process involves the heart’s four chambers and is divided into two main circulatory pathways: pulmonary circulation and systemic circulation.

Step-by-Step Blood Circulation Through Heart:

1. Return to the Heart

   • Oxygen-poor blood enters the right atrium via the superior vena cava (upper body) and inferior vena cava (lower body).

2. Right Atrium to Right Ventricle:

   • The right atrium contracts, pushing blood through the tricuspid valve into the right ventricle.

3. Right Ventricle to Lungs:

   • The right ventricle contracts, sending blood through the pulmonary valve into the pulmonary artery.
   • Blood travels to the lungs to receive oxygen and release carbon dioxide.

4. Return to the Heart (Blood Circulation Through Heart):

   • Oxygen-rich blood returns to the left atrium via the pulmonary veins.

5. Left Atrium to Left Ventricle:

   • The left atrium contracts, pushing blood through the mitral (bicuspid) valve into the left ventricle.

6. Left Ventricle to Body (Blood Circulation Through Heart):

   • The left ventricle contracts, sending blood through the aortic valve into the aorta.
   • Oxygen-rich blood is distributed to the body’s organs and tissues via arteries, arterioles, and capillaries.

7. Completion of the Circulatory Loop:

   • Oxygen-poor blood is collected from tissues through venules and veins, returning to the right atrium, and the cycle repeats.

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