Heart rate response to exercise Cardiac control centre

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Heart rate response to exercise
Cardiac control centre
Understand how exercise effects the heart rate
Know what the cardiovascular drift is.
Understand how the heart is controlled.
AS PE Anatomy and Physiology
Cardiac control centre
Cardiac control centre
Sympathetic nervous
system
Parasympathetic nervous
system
Increases heart rate
and SV
Decreases the heart rate.
Via
accelerator
nerve
AS PE Anatomy and Physiology
SA
Via Vagus
nerve
Heart regulation during exercise
 Rule of three two one.
 3 Neural factors
 2 Intrinsic factors
 1 Hormonal
AS PE Anatomy and Physiology
1 Hormonal




Adrenalin
From adrenal glands
Stimulates the SA node directly via blood.
This increases the heart rate as well as the stroke
volume.
AS PE Anatomy and Physiology
2 Intrinsic
 Temperature
 Increase in temperature which speeds up the nerve
impulse, which in turn speeds up the heart rate.
 Venous return
 Increase in SV (staling’s law)
 Increase in HR and SV
AS PE Anatomy and Physiology
3 Neural
 Baroreceptors Baro = pressure
 Increase in blood pressure = decrease in HR but is
neutralised due to demand of 02.
Chemoreceptors Chemo = Chemical
In muscle aorta and carotid arteries
1) Decrease in PH
2) Increase in pp Co2
3) Decrease in pp O2
Proprioceptors
Muscle spindles, joint receptors
Increase in motor activity = increase in HR and SV
AS PE Anatomy and Physiology
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Reuben
Giles
charlie
alex
kay
liam
george
AS PE Anatomy and Physiology
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