What Stroke Volume is and How to Calculate it

Leslie Samuel introduces episode 49 of Interactive Biology TV, focusing on stroke volume and its calculation. He expresses gratitude to viewers and explains heart function, including systole, diastole, end diastolic volume (EDV), and end systolic volume (ESV). A graph is used to illustrate these concepts, and the stroke volume is calculated as the difference between EDV and ESV. The episode concludes with a mention of additional resources available on the website.

What is the main focus of the introduction section?

• Discussing the details of heart contraction

• Describing the function of the left ventricle

• Thanking viewers and acknowledging their feedback

• Explaining the concept of stroke volume

What does stroke volume refer to?

• The total blood volume in the body

• The amount of blood pumped by one ventricle per heartbeat

• The speed of blood flow in the arteries

• The pressure of blood in the veins

Which part of the heart is primarily discussed in the stroke volume section?

• Right atrium

• Left ventricle

• Right ventricle

• Left atrium

What is systole?

• Filling of the ventricles

• Relaxation of the heart

• Contraction of the heart

• Emptying of the atria

What does end diastolic volume (EDV) represent?

• Blood volume in the aorta

• Blood volume in the atria

• Blood volume before ventricular contraction

• Blood volume after ventricular contraction

How is stroke volume calculated?

• EDV minus ESV

• ESV minus EDV

• Heart rate times ESV

• Heart rate times EDV

If the end diastolic volume is 120 ml and the end systolic volume is 50 ml, what is the stroke volume?

• 170 ml

• 70 ml

• 50 ml

• 120 ml