Control of Cardiac Output

Question 1

What is cardiac output?

Answer 1

• The volume of blood pumped by each ventricle per minute.

- CO = HR x SV

Question 2

What is stroke volume?

Answer 2

• Blood ejected from left ventricle per contraction.

- EDV-ESV

Question 3

What factors affect stroke volume and cardiac output?

Answer 3

• Preload
• Contractility
• Afterload

Question 4

What is the difference between intrinsic and extrinsic control?

Answer 4

extrinsic mechanism regulate blood flow throughout the body, while intrinsic mechanisms regulate blood flow to specific target tissues.

Question 5

What does the Frank-Starling law state?

Answer 5

• the stroke volume of the left ventricle will increase as the left ventricular volume increases due to myocyte stretch causing more forceful systolic contractions.
• increased venous return results in increased stroke volume.