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A-Level PE Anatomy And Physiology > Vascular Shunt Mechanism > Flashcards

Flashcards in Vascular Shunt Mechanism Deck (15)
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1

During exercise, what does the VCC do

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

2

During recovery what does the VCC do

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

3

What do the chemoreceptors do during exercise and recovery

Measure increases and decreases of 02 and C02 etc...

4

What do the baroreceptors do during exercise and recovery

Detect increases and decreases in blood pressure

5

What do the proprioceptors detect during exercise and recovery

Increases and decreases in muscle activity

6

What are intrinsic factors referring to during heart rate regulation

Factors inside the heart

7

What are extrinsic factors referring to when talking about heart regulation

Factors outside the heart

8

What are the two intrinsic factors of heart regulation

1. Temperature
2. VR

9

What are the 4 extrinsic factors of heart rate regulation

1. Baroreceptors
2. Chemoreceptors
3. Proprioceptors
4. Adrenaline

10

How does temperature effect heart rate during exercise

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

11

How does VR effect heart rate during exercise

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

12

How to the receptors effect heart rate during exercise

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

13

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

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

14

How do the 3 receptors decrease HR during recovery

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

15

How does temperature effect heart rate during recovery

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

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