6A: Control of heart rate Flashcards
How does the heart respond to High blood pressure?
Neurone and transmitter: Impulses are sent to the medulla, where impulses are sent along the parasympathetic neurones. These secrete acetylcholine, which binds to receptors on the SAN.
How does the heart respond to low blood pressure?
Neurone and transmitter: Impulses are sent to the medulla, where impulses are sent along the sympathetic neurones. These secrete noradrenaline, which binds to receptors on the SAN.
How does the heart respond to high blood O2, low CO2 or high pH levels?
Neurone and transmitter: Impulses are sent to the medulla, where impulses are sent along the parasympathetic neurones. These secrete acetylcholine, which binds to receptors on the SAN.
How does the heart respond to low blood O2, low CO2 or high pH levels?
Neurone and transmitter: Impulses are sent to the medulla, where impulses are sent along the sympathetic neurones. These secrete noradrenaline, which binds to receptors on the SAN.
What is the effector for these responses?
Cardiac Muscles
What are the recpetors for control of the heart
Chemoreceptors detect chemical changes in the blood.
Baroreceptors detect high/low blood pressure.
What is the response if there is high blood pressure?
Heart rate slows down to reduce blood pressure back to normal.
What is the response if there is low blood pressure?
Heart rate speeds up to increase blood pressure back to normal.
What is the response if there is High blood O2, low CO2 or high pH levels?
Heart rate decreases to return O2, CO2 and pH levels back to normal.
What is the response if there is Low blood O2, high CO2 or low pH levels?
Heart rate increases to return O2, CO2 and pH levels back to normal.
Where are baroreceptors?
In the aorta and the carotid arteries
Where are chemoreceptors?
In the aorta, carotid arteries and the medulla.
