Lecture 10

Question 1

Which ventricle generates pressure for systemic circulation?

Answer 1

Left

Question 2

What are the relative blood pressures in vessels throughout systemic circulation?

Answer 2

• high and oscillatory in major arteries
• falls steeply across arterioles, capillaries and venues ( oscillatory nature is reduced)
• very low in veins

Question 3

What ( aside from the heart) provides a driving force for blood flow in systemic circulation?

Answer 3

Large pressure difference between arterial and venous sides

Question 4

What is the equation for flow rate?

Answer 4

Q= P/R

Flow rate = pressure difference/ resistance

Question 5

What is the mean arterial pressure equation?

Answer 5

MAP= CO x TPR

Mean arterial pressure = cardiac output x total peripheral resistance

Question 6

What is the cardiac output equation?

Answer 6

CO= SV x HR

Cardiac output= stroke volume ( L/ beat) x Heart rate (beats / min)

Question 7

What are baroreceptors?

Answer 7

Blood pressure sensors- very sensitive stretch receptors in arterial walls that signal to brain if blood pressure increases or decreases

Question 8

Where are baroreceptors?

Answer 8

• aortic arch

- common carotid arteries

Question 9

Which nerve decreases heart rate and how?

Answer 9

• vagus nerve ( parasympathetic)

- Tells AV node to have longer pause

Question 10

Which nerve increases heart rate and how?

Answer 10

• sympathetic cardiac nerves
• tells SA node to fire more quickly
• tells AV node to have a shorter pause