Properties of Arteries, Capillaries and Veins

Question 1

Ohm’s Law

Answer 1

Flow = Pressure / Resistance

Question 2

Resistance in series is ______

Answer 2

additive

NB: Flow is constant

Question 3

Resistance in parallel is _____

Answer 3

reciprocal 1/Rt = 1/R1 + 1/R2

NB: Flow is NOT constant

Question 4

Poiseuille’s Law

Answer 4

Resistance = (8 * Viscosity * Length)/ (pi * r ^4)

Question 5

Result of Polycythemia

Answer 5

Increase in blood viscosity

Results in increased resistance and decreased flow

Question 6

Reynolds Number measures _________

Answer 6

Turbulent Flow

Increased reynold’s number = Increased turbulent flow

Question 7

Relationship between flow, area and velocity

Answer 7

Flow = Velocity * Area

Question 8

Reynold’s Formula

Answer 8

Nr = (2* density * radius * velocity) / (viscosity)

Question 9

Largest drop in Blood Pressure occurs at the ______

Answer 9

arterioles

Question 10

Greatest control of Blood pressure occurs at the _____

Answer 10

capillaries

capillaries control overall resistance

Question 11

Role of capillaries

Answer 11

provide nutrition to the tissues

provide oxygen to meet metabolic needs and remove CO2

Question 12

Starling Equation

Answer 12

Fluid Movement = Kf *[(Pc-Pi)-sigma(pi c - pi i)]

Question 13

Role of myogenic activity in capillary blood flow

Answer 13

increase in pre-capillary pressure causes constriction of terminal arterioles

Question 14

Angiotensin II role in capillary blood flow

Answer 14

Angiotensin II deceases arteriole radius (vasoconstrictor) decreasing pressure in capillaries