Heart Blood Flow

Understanding Heart Blood Flow

  • Heart blood flow is essential for delivering oxygenated blood to the body and returning deoxygenated blood back to the heart.

Difference Between Arteries and Veins

  • Arteries

    • Carry blood away from the heart.

    • Include a notable letter ‘A’ in their name.

  • Veins

    • Carry blood towards the heart.

    • Important to identify their role in returning blood.

Venous Return to the Heart

  • Blood returns to the heart via two main veins:

    • Superior Vena Cava (SVC):

      • Carries blood from the upper body.

    • Inferior Vena Cava (IVC):

      • Carries blood from the lower body.

  • Both SVC and IVC direct blood into the Right Atrium.

  • This blood is deoxygenated, meaning it needs oxygen.

Right Atrium to Right Ventricle

  • The right atrium contracts and pushes blood into the Right Ventricle.

  • Blood travels through the Tricuspid Valve (3 leaflets) into the right ventricle.

Role of the Right Ventricle

  • Right Ventricle:

    • Pumps deoxygenated blood to the lungs to receive oxygen.

    • Contracts and sends blood into the Pulmonary Artery.

    • The pulmonary artery leads to the lungs, where gas exchange occurs.

Gas Exchange in the Lungs

  • In the pulmonary arteries, blood gets oxygenated in the lungs.

  • Pulmonary Veins return oxygen-rich blood back to the heart.

Moving to the Left Side of the Heart

  • After oxygenation, blood enters the Left Atrium through the pulmonary veins.

  • The left atrium contracts and pushes blood through the Mitral Valve into the Left Ventricle.

Role of the Left Ventricle

  • Left Ventricle:

    • Pumps oxygenated blood to the rest of the body.

    • Blood exits the left ventricle through the Aorta, the large artery that distributes blood throughout the body.

Conclusion

  • The heart cycle of blood flow is a continuous process:

    • Deoxygenated Blood → Right Atrium → Right Ventricle → Pulmonary Artery → Lungs → Oxygenated Blood → Pulmonary Veins → Left Atrium → Left Ventricle → Aorta → Body.

  • Reinforcement through repeated review of the flow is encouraged for mastery.