Question

What is the volume of blood in one ventricle before contraction

A) end systolic volume (ESV)
B) stroke volume (SV)
C) heart rate (HR) D) venous return (VR)
E) cardiac output (CO)
F) end diastolic volume (EDV)

Answer 1

The volume of blood in a ventricle before contraction is known as the end diastolic volume (EDV) or preload, which is typically about 130 mL in a resting adult.

Step-by-step explanation:

The volume of blood in one ventricle before contraction is referred to as the end diastolic volume (EDV), which is also known as the preload. This is the amount of blood present in the ventricles right at the end of atrial systole and just before the onset of ventricular contraction. In a resting adult in a standing position, the EDV typically measures approximately 130 mL of blood. As the heart moves into the ventricular systole phase, the ventricles begin to contract, decreasing the volume of blood contained within the ventricle. The leftover volume after the heart contracts and pumps the blood out is known as the end systolic volume (ESV). The difference between the EDV and the ESV represents the stroke volume (SV), the amount of blood ejected by the ventricles during each heartbeat.