High blood pressure : Baroreceptors detect high blood pressure - send impulses along sensory neurones to the medulla - sends impulses along parasympathetic neurones - secretes acetylcholine - binds to receptors on the SAN- causing heart rate to slow down in order to reduce blood pressure back to normal.
Low blood pressure : Baroreceptors detect low blood pressure-send impulses along sensory neurones to the medulla - sends impulses along sympathetic neurones- secrete noradrenaline- binds to receptors on the SAN- causing heart rate to speed up in order to return blood pressure back to normal.
High blood O2, low CO2 or high blood pH levels:Chemoreceptors detect chemical changes in the blood- send impulses along sensory neurones to the medulla - sends impulses along parasympathetic neurones- secrete acetylcholine- binds to receptors on the SAN- causing heart rate to decrease in order to return O2, CO2, and pH levels back to normal.
Low blood O2, high CO2 or low blood pH levels: Chemoreceptors detect chemical changes in the blood - send impulses along sensory neurones to the medulla - send impulses along sympathetic neurones - secrete noradrenaline - binds to receptors on the SAN - causing heart rate to increase in order to return O2, CO2, and pH levels back to normal.
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