Lecture 11 - Circulation of the Blood

Question 1

What two factors determine blood flow (F)?

Answer 1

Pressure difference (between A and B) and Vascular Resistance

Question 2

What is the law describing blood flow? (Name and equation)

Answer 2

Darcy’s Law: F=ΔP/R

Question 3

Which three factors affect vascular resistance to blood flow?

Answer 3

Vessel length, vessel radius, and viscosity

Question 4

What is the relationship between Resistance (R) and vessel radius (r)

Answer 4

R is proportional to r^4

Question 5

What formula describes the factors affecting Resistance? (Name and Equation)

Answer 5

The Poiseuille-Hagen formula (R=8LΠ/πr^4)

Question 6

What feature of the Cardiovascular System helps to maintain blood flow during diastole (that was mentioned)?

Answer 6

Elastic arteries act as “pressure reservoirs”

Question 7

What do blood pressure values actually represent?

Answer 7

The arterial pressure gradient, measured at the Brachial Artery (bigger number = systole, smaller number = diastole)

Question 8

In what order does an electrical signal travel through the cardiac conducting system?

Answer 8

SAN -> Atria -> AVN -> Bundle of His -> Ventricular Myocardium