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BPK205 > CardioVascular Physiology 3 > Flashcards

CardioVascular Physiology 3 Flashcards

1
Q

Systole Defenition

A

contraction

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2
Q

Distole Defenition

A

Relaxation

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3
Q

Mechanical Events

A
  1. Late Diastole
  2. Atrial Systole
  3. Isovolumic Ventricular Contraction
  4. Ventricular Ejection
  5. Isovolumic Ventricular Relaxation
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4
Q

Late Diastole

A
  • all chambers are relaxed, ventricles fill passively
  • SL valves closed, AV valves open
  • ventricle volume increases
  • ventricle pressure low
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5
Q

Atrial Systole

A
  • atrial contraction forces a small amount of blood into ventricles (15%)
  • ventricle pressure increases
  • ventricle volume increases
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6
Q

Isovolumic Ventricular Contraction

A
  • increasing ventricle pressure
  • pushes AV valves closed
  • pressure not great enough to open SL valves
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7
Q

Ventricular Ejection

A
  • ventricle pressure great enough to open SL valves
  • ventricle volume begins decreasing
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8
Q

Isovolumic Ventricular Relaxation

A
  • ventricle pressure decreases
  • ventricle volume decreases
  • blood flows back to close SL valves
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9
Q

Stroke Volume

A

is the amount of blood pumped by one ventricle during contraction

SV = EDV - ESV

  • average is 70mL/beat
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10
Q

Cardiac Output

A

is the volume of blood pumped by one ventricle in a given period of time

CO = HR x SV

  • average is 5L/min
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11
Q

Heart Murmur Timing

A

at the beginning and end of ventricle systole

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12
Q

Chronotropic effect

A

modulation of heart rate
- occurs on the SA Node, can be from psns or sns

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13
Q

Inotropic Effect

A

modulation of ventricular myocytes contractility
- only caused by sns

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14
Q

ANS heart rate receptors

A

Sympathetic: NE on beta1 receptors
Parasympathetic: ACh on M2 receptors

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15
Q

Modulation of Stroke Volume

A

stroke volume = contraction force
- contraction force is determined by the length of sarcomeres and the comtractility of the muscle

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16
Q

Myocyte Sarcomere Length

A

is determined by the EDV, larger EDV = longer sarcomere = larger stroke volume

17
Q

Factors that increase EDV

A
  1. increased venous blood return to the heart
  2. decreased HR b/c of a larger filling time

BPK205 (26 decks)

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