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AS PE control of HR

Control of heart rate

QuestionAnswer
What does CCC stand for? Cardiac control centre
Where is the CCC? In medulla in brain
What are the two parts to the autonomic nervous system? Sympathetic and parasympathetic
What part of the autonomic nervous system sends signals to decrease heart rate? Parasympathetic via the vagus nerve
What part of the autonomic nervous system sends signals to increase heart rate? Sympathetic via the accelerator nerves
Name three neural factors that inform the CCC when heart rate needs to in/decrease Baroreceptors / Proprioceptors / Chemoreceptors
What are intrinsic factors which affect heart rate? Temperature increases HR increases / Venous return increase HR increases
Where are proprioceptors found and what do they detect? In muscles and tendons / movement
What are Baroreceptors and where are they found? Found in walls of vena cava and aorta and detect increase in blood flow and blood pressure (stretch receptors)
What do chemoreceptors detect? increase in blood acidity
What are intrinsic factors which affect heart rate? Temperature increases HR increases / Venous return increase HR increases
What do thermoreceptors detect? Changes in temperature
What does adrenalin do? • Increasing heart rate & strength of contraction • Constricting blood vessels • Increases blood glucose by stimulating the break down of glycogen
Created by: Tina Dean
 

 



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