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Physl > Cardiovascular Physiology 1 > Flashcards

Cardiovascular Physiology 1 Flashcards

1
Q

What is Hemodynamics?

A

The study of blood flow

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2
Q

What is the formula for blood flow?

A

F= 𝛥p/R

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3
Q

What is Resistance?

A

The friction that impedes flow

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4
Q

What are the units of flow?

A

mL/min

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5
Q

What are the units of pressure?

A

mmHg

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6
Q

What are the units of resistance?

A

mmHg/mL/min

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7
Q

What is the driving force for flow?

A

The pressure difference between two points

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8
Q

What must the relationship between the difference in pressure in order to have flow?

A

𝛥P>R

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9
Q

What is blood flow determined by?

A

The pressure difference between two points and the resistance to flow

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10
Q

What is the major mechanism for changing blood flow in the cardiovascular system?

A

Altering the resistance of the blood vessels

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11
Q

What portion of the flow equation cannot be measured directly?

A

Resistance, but it can be calculated

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12
Q

What is Blood Hydrostatic pressure?

A

The pressure that the volume of blood within our circulatory system exerts on the walls of the blood vessels that contain it

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13
Q

What happens to blood flow when there is no pressure difference?

A

There is no blood flow

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14
Q

What determines the Resistance to blood flow?

A
  • Viscosity of the blood
  • Length of the blood vessel
  • Diameter of the blood vessel
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15
Q

Why can’t Resistance be measured?

A

Because it is determined by several factors

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16
Q

What is Viscosity?

A

The friction between molecules of a flowing fluid

17
Q

Why is blood not considered a homogenous fluid?

A

It contains many things like electrolytes and proteins and formed elements

18
Q

What are the Formed elements in blood?

A

RBCs, WBCs and Platelets

19
Q

What is the Hematocrit?

A

The number of RBCs in the blood

20
Q

What can change the viscosity of the blood?

A

The hematocrit

21
Q

How does blood vessels Length and Diameter affect the viscosity?

A

They affect it by determining the amount of contact between moving blood and stationary wall of vessel

22
Q

How is friction affected by blood vessel length?

A

A blood vessel with a longer length will produce more friction

23
Q

In what physical way does blood flow through vessels?

A

In concentric layers

24
Q

How does the orderly layer affect blood flowing through vessels?

A

It helps to reduce energy losses in the flowing blood by minimizing viscous interactions between the adjacent layers of the blood and the blood vessel

25
Q

What is the relationship between viscosity, vessel length and vessel radius described by?

A

Poiseuille’s law

26
Q

What is Poiseuille’s equation?

A

R = (8ɳl)/(πr^4)

27
Q

What does R represent?

A

Resistance to blood flow

28
Q

What does ɳ represent?

A

Viscosity of blood

29
Q

What does l represent?

A

Length of the vessel

30
Q

What does r represent?

A

The radius of the blood vessel

31
Q

What is Resistance to flow inversely proportional to?

A

Radius of the vessel

32
Q

What is the factor with the greatest effect on blood flow?

A

The radius of the blood vessel

Physl (94 decks)

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