Regulation Of Heart Rate During Exercise

Question 1

Intrinsic factors (inside heart) that regulate heart rate during exercise

Answer 1

Inc temperature

Inc vr stretches right atrium SA node detects this and Inc stimulation

Question 2

How does increased temperature regulate the heart

Answer 2

Causes increased speed of nerve transmission
Increased stimulation of SA node
Increases heart rate

Question 3

How does increased VR regulate heart rate

Answer 3

Increased volume of blood returning
Stretches the walls of the heart
Increased stimulation of SA node
Increases HR

Question 4

Extrinsic factors that regulate the heart

Answer 4

Neurol factors 
Chemo receptors 
Baroreceptors 
Proprioceptors 
Receptors send info to VCC in turn increases stimulation of SA node via the sympathetic nervous system in turn Inc HR

Question 5

Hormonal factors that regulate the heart rate during exercise

Answer 5

Adrenaline released prior to exercise which stimulates the sympathetic nervous system which increases stimulation of SA node which increases hr
Adrenaline also increases force of cardiac contractions increased SV and Q