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AS PE control of HR
Control of heart rate
| Question | Answer |
|---|---|
| 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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