Factors of Regulating Heart Rate
- Created by: cara12
- Created on: 13-04-19 14:31
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- Factors Regulating Heart Rate
- Neural
- vasomotor centre responds to changes detected by : Barroreceptors,Chemoreceptors,Proprioreceptors
- Barroreceptors:Sensors detecting changes in blood pressure
- Chemoreceptors:Sensors detecting chemical changes within the blood
- Proprireceptors:Detect the changes in body position
- Receptors send an impulse to cardiac control centre in the medulla oblongata which sends an impulse to the SA node either via:
- Parasympathetic nervous system(vagas nerve)to slow heart rate
- Sympathetic nervous system(acceleratory nerve)to increase heart rate
- Hormonal
- Adrenaline and noradrenaline released from adrenal glands.
- Adrenaline is released into the bloodstream,and stimulates the adrenergic receptors and SA node found in the heart,increasing HR.
- Release of adrenaline before exercise is known as the anticipatory rise
- Intrinsic
- Higher temperature caused through exercising causes increased HR as heart works harder to get blood to the skin so heat can be lost
- It also concerns the venous return mechanism
- Venous return
- The rate at which blood returns to the heart
- Intensity increases: Blood redistribution needs to be quicker otherwise cardiac output decreases
- Exercise increases it through the muscle pump and respiratory pump which forces blood back to the heart
- This process is also aided by pocket valves in the veins,smooth muscle in the walls of the blood vessels and gravity
- Exercise increases it through the muscle pump and respiratory pump which forces blood back to the heart
- During recovery:Lower VR results in a lower SV.Due to reduced stretching of the ventricles with a low VR(Frank-Starling law)
- Neural
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