Vascular Shunt Mechanism Flashcards

1
Q

During exercise, what does the VCC do

A

The VCC decreases sympathetic stimulation of the arteriolar and pre-capillary sphincters to the working muscles and increases sympathetic stimulation of the arterioles and pre-capillary sphincters to the organs

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2
Q

During recovery what does the VCC do

A

Increases sympathetic stimulation of arteriols and pre-capillary sphincters to working muscles and decreases the sympathetic stimulation of the arteriols and re-capillary sphincters to the organs

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3
Q

What do the chemoreceptors do during exercise and recovery

A

Measure increases and decreases of 02 and C02 etc…

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4
Q

What do the baroreceptors do during exercise and recovery

A

Detect increases and decreases in blood pressure

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5
Q

What do the proprioceptors detect during exercise and recovery

A

Increases and decreases in muscle activity

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6
Q

What are intrinsic factors referring to during heart rate regulation

A

Factors inside the heart

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7
Q

What are extrinsic factors referring to when talking about heart regulation

A

Factors outside the heart

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8
Q

What are the two intrinsic factors of heart regulation

A
  1. Temperature

2. VR

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9
Q

What are the 4 extrinsic factors of heart rate regulation

A
  1. Baroreceptors
  2. Chemoreceptors
  3. Proprioceptors
  4. Adrenaline
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10
Q

How does temperature effect heart rate during exercise

A

Increased temperature causes increase speed of nerve transmission which stimulates the SA node which causes HR to increase

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11
Q

How does VR effect heart rate during exercise

A

An increase in blood returning to the heart causes an increased chamber wall stretch causing HR, SV and Q to increase

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12
Q

How to the receptors effect heart rate during exercise

A

The 3 receptors send info to the CCC which causes sympathetic nervous system to increase firing rate of the SA node which causes HR to increase

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13
Q

How does adrenaline effect heart rate during exercise (2 things)

A
  1. Stimulates sympathetic nervous system which increases the firing rate of the SA node
  2. Increases the force of cardiac contractions causing HR, SV and Q to increase
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14
Q

How do the 3 receptors decrease HR during recovery

A

Sends info to CCC which stimulates the parasympathetic nervous system which decreases the firing rate of the SA node

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15
Q

How does temperature effect heart rate during recovery

A

Decreases the speed of nerve transmission which reduces SA node stimulation which therefore lowers heart rate

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