Final answer:
Preload is the pressure in the ventricle at the end of diastole and is influenced by factors such as end diastolic volume (EDV) and filling time. It is a key factor in determining stroke volume.
Step-by-step explanation:
The pressure in the ventricle at the end of diastole is called preload. Preload refers to the amount of blood in the ventricles at the end of atrial systole just before ventricular contraction. It is one of the factors that influence stroke volume, which is the amount of blood pumped from the heart during each contraction of the ventricles.