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Physiology > Ch 12 Cardiac Physiology Part 1 & 2 > Flashcards

Ch 12 Cardiac Physiology Part 1 & 2 Flashcards

1
Q

Cardiovascular system contains

A

Heart and blood vessels

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2
Q

Circulatory system contains

A

heart, blood vessels, and blood

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3
Q

3 blood vessel types

A

arteries, veins, capillaries

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4
Q

Pulmonary circulation bring blood from…

A

right ventricle to the lungs

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5
Q

Systemic circulation brings blood from…

A

Left ventricle to all tissues of the body

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6
Q

Flow equation

A

F=P/R

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7
Q

Pressure is the…

A

force exerted by blood measured in mmHg

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8
Q

How does blood flow directionally

A

Higher to lower pressure

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9
Q

Flow is…

A

Volume of blood moved per unit of time
Measure in Ml/min

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10
Q

Resistance is…

A

Measure of friction that impedes flow

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11
Q

Factors that determine resistance

A

Viscosity
Length
Radius

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12
Q

What is blood viscosity

A

Friction between molecules of a flowing fluid

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13
Q

Blood vessel radius is…

A

inversely proportional to resistance

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14
Q

Resistance equation

A

R=(8L)/(pir^4)

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15
Q

What are cardiomyocytes

A

Cardiac muscle cells that contract with every heart beat

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16
Q

What type of cells start the conducting system

A

Pacemaker cells

17
Q

Electrical contact through cardiomyocytes occur via what

A

Gap junctions

18
Q

Name the electrical signals in order

A

SA node
AV node
Bundle of his
Purkinje Fibers

19
Q

Bundle of his passes through what

A

Interventricular septum towards the apex

20
Q

Purkinje fibers are what

A

nerve like processes spread throughout myocardium

21
Q

Sinus rhythm is triggered by what? and what is an adult’s typical bpm

A

Triggered by SA node
70-80 bpm

22
Q

How often does the SA node fire

A

every 0.8 seconds

23
Q

Ectopic focus is…

A

region of spontaneous firing other than the SA node

24
Q

Nodal rhythm is what

A

heart rate set by AV node if SA node gets damaged

25
Q

Cardiomyocyte resting potential is what

A

-90mV

26
Q

What occurs during the depolarization phase

A

Fast opening of voltage gated Na+ channels
Na+ rushes into the sarcoplasm
Peaks at +30mV

27
Q

What occurs during the plateau phase

A

Transient outward K+ current activated
Ca2+ enters

28
Q

What occurs during the repolarization phase

A

Ca2+ channels close
Voltage gated K+ channels open

29
Q

Pacemaker potential starts at what mV

A

-60mV

30
Q

Deoplarization occurs at what mV

A

-40mV

31
Q

What is Afib

A

Most common sustained Arrythmia

32
Q
A

Physiology (8 decks)

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