lec 8

Question 1

the highest resistance in CVS is present in

Answer 1

arterioles (smallest in diameter)

Question 2

sounds during turbulent flow

Answer 2

murmurs.

Question 3

turbulent flow

Answer 3

valvular disease, renal artery stenosis, and carotid artery stenosis

Question 4

how to measure of the tendency for turbulence to occur.

Answer 4

Reynolds’s Number:

Question 5

Reynolds’s Number: depends on

Answer 5

velocity, diameter, viscosity and the density.

Question 6

If Re < 2000

Answer 6

flow is not turbulent

Question 7

If Re >3000

Answer 7

turbulence is almost always present

Question 8

Conditions where turbulent flow may occur

Answer 8

When rate of blood flow becomes too great.

Obstruction in a vessel.

Sharp turn.

Viscosity of blood is low.

Question 9

Measuring blood flow

Answer 9

Electromagnetic flow meter.

- Ultrasonic Doppler flow meter

Question 10

flow

Answer 10

• Flow = pressure / resistance or

- Flow= volume / time

Question 11

types of flow

Answer 11

Laminar flow and Turbulent flow

Question 12

Methods for measuring blood pressure

Answer 12

Mercury manometer

High fidelity method

Question 13

resistance

Answer 13

P/Q

Question 14

the resistance depends on how much is the diameter .

Answer 14

More diameter → less resistance

Question 15

تصلب الشراين

Answer 15

deposit fat in the subendothelium of vessels

thicker vessels →↓ diameter → ↑ resistance → ↑ B.P

Question 16

The peripheral resistance is equal to

Answer 16

1

Question 17

The pulmonary resistance equals

Answer 17

%14 of the peripheral resistance.

Question 18

Conductance

Answer 18

1/ resistance

If you increase pressure one unit how much is the change in flow

Question 19

Poiseuille’s law:

Answer 19

When the radius increases, flow increases to the power of 4”