Final answer:
The normal filling rate of the left ventricle during diastole is approximately 70-80 percent of its capacity, with atrial contraction contributing the remaining 20-30 percent. The mean stroke volume for a resting adult is about 70 mL, which indicates the volume of blood ejected per heartbeat.
Step-by-step explanation:
The normal filling rate of the left ventricle (LV) of the heart is a crucial aspect of its function, as it determines how much blood gets filled during diastole, ready for the next contraction. During a resting state, the ventricles are filled with approximately 70-80 percent of their capacity from the blood inflow during diastole, and atrial contraction adds the remaining 20-30 percent. It is mentioned that a mean stroke volume (SV) for a resting adult would be approximately 70 mL, signifying the amount of blood pumped out of the left ventricle with each heartbeat. The end-diastolic volume (EDV) or preload, at the end of atrial systole and just prior to ventricular systole, is around 130 mL in a resting adult when standing.