OCR A Biology
Heart Rate Centres Receptors Blood Controlling Sending Impulses
| Front |
controlling heart rate, what centres are involved and how are these centres stimulated? |
| Back |
- heart rate controlled by ANS
- medulla responsible for controlling heart rate (has 2 centres linked by motor neurones to SAN)
- one increases heart rate by sending impulses through sympathetic NS (transmitted by accelerator nerve)
- one decrease heart rate by sending impulses through parasympathetic NS (transmitted by vagus nerve)
- centre stimulated depends on info recieved by receptors in blood vessels;
- baroreceptors (pressure receptors detecting changes in blood pressure (e.g if too low, need to inc heart rate) present in aorta, vena cava and carotid arteries)
- chemoreceptors (chemical receptors detecting changes in levels of particular chemicals in blood (e.g CO2), present in aorta, carotid arteries (major artery in neck supplying brain with blood) and medulla)
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OCR A Biology