Question

What are the 4 phases of diastole? What is open/closed?

a) Isovolumetric relaxation (both valves closed), rapid filling (mitral valve open), diastasis (both valves open), atrial contraction (mitral valve open)
b) Rapid filling (both valves open), diastasis (mitral valve open), isovolumetric relaxation (aortic valve open), atrial contraction (mitral valve open)
c) Isovolumetric relaxation (mitral valve open), rapid filling (aortic valve open), diastasis (both valves open), atrial contraction (mitral valve open)
d) Diastasis (mitral valve open), rapid filling (both valves open), atrial contraction (both valves closed), isovolumetric relaxation (aortic valve open)

Answer 1

4 phases of diastole are a) Isovolumetric relaxation (both valves closed), rapid filling (mitral valve open), diastasis (both valves open), atrial contraction (mitral valve open)

Step-by-step explanation:

The four phases of diastole are isovolumetric relaxation, rapid filling, diastasis, and atrial contraction. In isovolumetric relaxation, both the mitral and aortic valves are closed as the heart relaxes and ventricular pressure decreases. During rapid filling, the mitral valve is open, allowing blood to flow from the atria into the ventricles.

Diastasis is the phase where both valves are open, and there is a slower filling of the ventricles. Atrial contraction follows, during which the mitral valve remains open, allowing the atria to contract and contribute additional blood to the ventricles.

Understanding these phases is crucial in comprehending the cardiac cycle, ensuring proper blood flow and coordination between atria and ventricles. These phases are essential for maintaining efficient cardiac function and are significant in the diagnosis and treatment of cardiovascular disorders.