Question

Interpret a graph of pressure change and volume change in diff chambers of the heart.

Accepted Answer

Pressure & volume graph
                Ventricular pressure:Low at first, increases gradually as ventricles fill as atria contractAV valves close, pressure rises drastically as ventricles contractSince higher pressure than aorta, blood is forced into the aorta Atrial pressure:Relatively low always bc thin walls cant create much forceHighest when contracting, drops when AV valve closes and walls relaxAtria then build up with blood - gradual increase in pressure until AV valve opens & blood moves into ventricleAortic pressure:Rises when ventricles contract - blood is forced into aorta and then gradually fallsBc elastic recoil produces temporary rise in pressure at start of diastoleVentricular volume:Rises as atria contract & ventricles fill with bloodDrops suddenly as blood is forced out the aorta when semilunar valve opensVolume rises again as ventricles fill with blood

Blood Pressure Ventricles Contract Rises Volume Fill Atria