Lecture 19

Question 1

Hemodynamics is

Answer 1

The study of blood flow

Question 2

Motion of heart and blood flow is detected using

Answer 2

Doppler effect

Question 3

Doppler US will _____ , ______- and _______ blood flow

Answer 3

Detect, qauntify and evaluate

Question 4

Humans have _____L of blood

Answer 4

5L

Question 5

Blood consists of (4)

Answer 5

RBC, WBC, platelets, pasma

Question 6

Blood functions to carry

Answer 6

02 CO2 nutrients and waste

Question 7

Arteries have valves or no

Answer 7

No

Question 8

Veins have ______ pulsatile flow than arteries

Answer 8

Pulsatile flow

Question 9

Pumping f the veins is from

Answer 9

Leg muscle contractions

Question 10

Between arteries and veins which are compressible

Answer 10

Veins

Question 11

Arteries become

Answer 11

Aterioles

Question 12

Veins extend from

Answer 12

Venules

Question 13

Capillaries

Answer 13

Nutrient and gas transfer
Few micormeters in fize
Join artioles and venules

Question 14

Valves

Answer 14

One-way
Prevent backflow of blood
In the heart and veins

Question 15

Stenotic valves

Answer 15

Dont open enough

Question 16

Insufficiency/regurgitation

Answer 16

Valves od close enough

Question 17

Hydrostatic pressure

Answer 17

Equivalent to the weight of a column f blood

Question 18

Hydrostatic pressure _________ WITH DISTANCE BELOW HEART

Answer 18

INCREASES

Question 19

In a supine patient the hydrostatic pressure is

Answer 19

0 mmHg

Question 20

In a standing patient the pressure in the veins is

Answer 20

100 mm/Hg

Question 21

Inspiiration

Answer 21

Diaphragm moves down
Increase in thoracic volume, decrease in thoracic pressure
Decreases in abdominal volume and increase in abdominal pressure
Stop venous return from legs

Question 22

Valsalva

Answer 22

Patient can be asked to hold thier breath and bear down

Increase in abdominal pressure

Stops venous return from legs

Question 23

Expiration

Answer 23

Diaphragm moves up
Decrease thoracic volume, increase in thoracic pressure
Increase in abdominal volume, decrease in abdominal pressure
Venous blod returns from legs

Question 24

Pressure is

Answer 24

Driving force behind fluid flow

Question 25

Pressure equation and unit

Answer 25

P = force/ area

Pa or N/m2

Question 26

a _________ is required for a fluid to flow

Answer 26

Pressure difference (delta P)

Question 27

Volumetric flow rate

Answer 27

Volume of blood passing a point per unit of time

Question 28

Equation and units of volumetric flow rate

Answer 28

Q= delta P/ R

Delta P is pressure gradient driving flow

R is resistance within the vessel

Question 29

Volumetric flow applies to a _____ _____ tube

Answer 29

Long straight tube

Question 30

Resistance is also considered to be

Answer 30

Long straight tube

Question 31

Resistance equations

Answer 31

R=8Ln/ pi r4

L- length of tube, cm
, n - viscosity, poise
, r - radius, cm

Question 32

Viscosity is

Answer 32

Resistance of flow offered by a fluid

Question 33

Unit and letter for viscosity

Answer 33

, n,

Unit is poise

Question 34

Increase in radius or diameter of the tube ________ resistance

Answer 34

Decreases

Question 35

What is the strongest parameter effect on resistance

Answer 35

Radius/diameter

Question 36

Resistance and radius relationship

Answer 36

R ~~~ 1/r4

Question 37

If radius doubles, R ______

Answer 37

Decreases by 16x

Question 38

Vasoconstriction

Answer 38

Smaller blood vessels, restricts blood flow

Question 39

Vasodilation

Answer 39

Larger blood vessels, allow more blood flow

Question 40

What is poiseuille’s equation

Answer 40

Q= (delta P)(Pi)(diameter)^4/ 128(L)(n)