Low blood pressure detected by baroreceptors stimulates the SAN via sympathetic nerves through the medulla, increasing heart rate to raise pressure.
Low blood pressure detected by baroreceptors leads to sympathetic stimulation of the SAN via the medulla using noradrenaline, increasing heart rate to raise blood pressure.
| Front | Low blood pressure |
|---|---|
| Back | Detected by baroreceptors Impuses sent to medulla which sends impulses along sympathetic neurones which secrete noradrenaline which binds to the receptors on SAN Heart rate speeds up to increase blood pressure back to normal |
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