heart valves

Structure of the Heart Valves

  • The heart valves serve as doors between the atria and the ventricles.
  • Main Purpose: Prevent backflow of blood, ensuring unidirectional flow.

Types of Heart Valves

  • Tricuspid Valve

    • Location: Between the right atrium and right ventricle.
    • Function: Opens to allow blood flow from the right atrium to the right ventricle.

  • Mitral Valve

    • Location: Between the left atrium and left ventricle.
    • Function: Opens to allow blood flow from the left atrium to the left ventricle.

  • Pulmonary Valve

    • Location: Between the right ventricle and pulmonary artery.
    • Function: Opens to allow blood flow from the right ventricle to the pulmonary artery, which transports blood back to the lungs for oxygenation.

  • Aortic Valve

    • Location: Between the left ventricle and the aorta.
    • Function: Opens to allow oxygen-rich blood to flow from the left ventricle into the aorta, distributing it to the body.

Cardiac Action Phases

  • The heart operates in two phases: Systole and Diastole.
  • Systole
    • Description: The working phase of the heart.
    • Action: Heart muscle contracts, pumping blood out of the heart.
  • Diastole
    • Description: The resting phase of the heart.
    • Action: Heart muscle relaxes and fills with blood in preparation for the next contraction.

Importance of Systole and Diastole

  • These phases are crucial for maintaining proper heart function.
  • Blood Pressure Measurement: When measuring blood pressure, systolic pressure is recorded over diastolic pressure (e.g., 120/80 mmHg).
  • Heart's Need for Rest: Continuous pumping without rest could lead to cardiac failure; adequate diastolic phases are needed for heart health.
  • Proper filling during diastole is essential for effective pumping during systole, ensuring blood circulation throughout the body.