Physics: 100727: Hemodynamics 2

Front 1

What 3 factors influence resistance in blood vessels?

Back 1

1. Length
2. Viscosity
3. Radius

Front 2

What is Poiseuille's Law?

Back 2

Flow = ((P1 - P2) * (r**4) * PI) / (Viscosity * Length * 8)

Front 3

Upon provocation, a healthy vessel gets ___, but a diseased vessel gets ____.

Back 3

better
worse

Front 4

What is central venous pressure (CVP)?

Back 4

The pressure in the right atrium

Front 5

Venous return is _____ proportional to the central venous pressure (CVP)

Back 5

inversely

Front 6

Cardiac output (CO) and venous return (VR) should be _____.

Back 6

equal

Front 7

Normal CVP is ____.

Back 7

2 - 5 mm Hg

Front 8

Pressure on the left side of the heart is about ___.

Back 8

120 mm Hg

Front 9

What 4 factors influence venous return?

Back 9

1. Gravity
2. Respiratory cycle
3. Venous tone
4. Muscle pump

Front 10

What type of pressure is created by gravity?

Back 10

Hydrostatic pressure

Front 11

Venous pressure increases by ____ for each cm below the right atrium in a standing person.

Back 11

1 mm Hg

Front 12

Venous pressure around the ankle is about ___ .

Back 12

90 mm Hg.

Front 13

When shifting from a lying to standing position, aortic mean pressure remains almost unchanged, because __ __ and ___ ___ ___ both rise.

Back 13

heart rate
total peripheral resistance

Front 14

Given that the heart level is at pressure 0, then below the heart, pressure is ___, and above the heart, pressure is ___.

Back 14

positive
negative

Front 15

Pressure measured = ___ ___ + ___ ___

Back 15

circulatory pressure
hydrostatic pressure

Front 16

"Phasic" or venous flow is also called ______.

Back 16

spontaneous

Front 17

Although venous flow is generally phasic, venous flow close to the heart may be partially _____.

Back 17

pulsatile

Front 18

During inspiration, venous flow to the heart ____, and venous flow in the legs _____.

Back 18

increases
decreases

Front 19

During expiration, venous flow to the heart ____, and venous flow in the legs _____.

Back 19

decreases
increases

Front 20

During inspiration, central venous pressure (CVP) _____, thereby ____ venous return.

Back 20

decreases
increasing

Front 21

What are the 3 pump systems in the lower extremity?

Back 21

1. Foot pump
2. Thigh pump
3. Calf venomotor pump

Front 22

What is the function of the foot pump?

Back 22

It primes the calf pump.

Front 23

What is the function of the thigh pump?

Back 23

It ejects the thigh blood volume

Front 24

What is the function of the calf venomotor pump?

Back 24

Major ejection

Front 25

What are two structures of the venous system we should know, and which venous system does each belong to?

Back 25

Great saphenous vein (belongs to deep venous system)

Lesser saphenous vein (belongs to superficial venous system)

Front 26

The greater saphenous vein is on the ____ side.

Back 26

medial

Front 27

The lesser saphenous vein is on the ____ side.

Back 27

lateral

Front 28

Internal perforating veins flow from ____ to ____.

Back 28

superficial
deep

Front 29

What is the main problem with deep vein thrombosis (DVT)s?

Back 29

That the clot will eventually make its way to the lungs, and cause pulmonic infarction, which can be deadly if > 20% of the lung function is compromised.

Front 30

What veins are common donors for grafting?

Back 30

Saphenous veins

Front 31

The sympathetic nervous system is associated with ____, and has a ___ effect on the cardiovascular system.

Back 31

Adrenalin
strong