Understanding Stroke Volume and its Relationship to EDV and ESV

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Which of the following is true about stroke volume (SV)?

SV is the volume of blood pumped per beat (correct)

SV is the volume of blood returned to the heart

SV is the volume of blood in the right ventricle

SV is the volume of blood in the left ventricle

What happens to the stroke volume (SV) when the end-diastolic volume (EDV) increases?

SV remains the same

SV cannot be determined

SV increases (correct)

SV decreases

What happens to the stroke volume (SV) when the end-systolic volume (ESV) decreases?

SV remains the same

SV cannot be determined

SV increases (correct)

SV decreases

What is the stroke volume (SV) if the end-diastolic volume (EDV) is 110 mL and the end-systolic volume (ESV) is 20 mL?

90 mL Signup and view all the answers

What is the average stroke volume (SV) per beat?

70 mL Signup and view all the answers

What is preload?

The degree of stretching experienced by the heart muscle cell during diastolic Signup and view all the answers

What is venous return?

The blood that returns to the heart Signup and view all the answers

How does gravity affect venous return?

Gravity affects the amount of blood getting returned to the heart Signup and view all the answers

What is the muscle pump?

The mechanism that helps return blood to the heart during standing and running Signup and view all the answers

What happens to venous return when transitioning from lying down to standing?

Venous return decreases Signup and view all the answers

According to Poiseuille's Law, which of the following factors has the greatest influence on blood flow rate?

Radius Signup and view all the answers

According to the text, if pressure increases, what will happen to resistance?

Resistance will increase Signup and view all the answers

Which of the following is the correct equation for calculating flow rate?

Q = P/R Signup and view all the answers

According to the text, what happens to flow rate when resistance decreases?

Flow rate will increase Signup and view all the answers

According to the text, what is the relationship between viscosity and flow rate?

More viscosity leads to a decrease in flow rate Signup and view all the answers

Which of the following correctly defines conductance?

Flow rate divided by pressure Signup and view all the answers

According to Reynold's number, which type of flow is faster in smaller vessels?

Turbulent flow Signup and view all the answers

According to the text, what is shear stress?

Force applied to make one plane move relative to the other Signup and view all the answers

According to the text, what causes vasodilation?

Hormones and metabolites Signup and view all the answers

According to the text, what is the relationship between vasomotion and blood flow?

Vasomotion decreases blood flow Signup and view all the answers

Which of the following is true about the Frank-Starling mechanism?

It causes the heart to contract harder due to increased stretch in the ventricles. Signup and view all the answers

What is the formula for calculating ejection fraction?

SV/EDV Signup and view all the answers

What is the main role of the parasympathetic nervous system in heart rate control?

It causes heart rate to decrease. Signup and view all the answers

What is the formula for calculating mean arterial pressure (MAP)?

MAP = ⅓ systolic + ⅔ Diastolic Signup and view all the answers

What causes an increase in systolic blood pressure during exercise?

Increase in cardiac output Signup and view all the answers

What is the formula for calculating pulse pressure?

DBP + (⅓ PP) Signup and view all the answers

What is the main role of the sympathetic nervous system in heart rate control?

It causes heart rate to increase. Signup and view all the answers

What is the main role of the muscle pump during standing and running?

To increase stroke volume Signup and view all the answers

What is the main cause of a decrease in stroke volume during heavy exercise?

Decreased venous return Signup and view all the answers

What is the formula for calculating the heart rate-pressure product (RPP)?

RPP = SBP x HR Signup and view all the answers