6A Control of Heart Rate Flashcards
Process of heart rate where does the SAN send electrical impulse
SAN sends electric impulse to atria walls
Process of heart rate where does the SAN send electrical impulse
SAN sends electric impulse to atria walls
What happens to the atria when they received the electrical impulse from the SAN
The atria contract
Where does the electrical impulse get transferred to with a slight delay
The bundle of His
Where does the electrical impulse get transferred to with a slight delay
The bundle of His
Where does the bundle of His conduct electrical impulse to
Pykyne fibres
Where do the purkinje fibres carry the impulse to
The muscle
What happens to the ventricles when the electrical impulse is carried from the purkyne to the muscles
They contract together
How do stimuli cause blood pressure to decrease
Baroreceptors in carotid arteries and aorta detect high blood pressure
Impulses are sent to the medulla which sends impulses along parasympathetic neurons
These secrete acetylcholine which binds to receptors on the SAN
Heart rate slows down to decrease blood pressure
How do stimuli cause blood pressure to decrease
Baroreceptors in carotid arteries and aorta detect high blood pressure
Impulses are sent to the medulla which sends impulses along parasympathetic neurons
These secrete acetylcholine which binds to receptors on the SAN
Heart rate slows down to decrease blood pressure
How does stimuli cause blood pressure to increase
Baroreceptors in the carotid arteries and the aorta detect low blood pressure
Impulses are sent to the medulla which sends impulses along the sympathetic neurones
These secrete noradrenaline which bind to receptors on the SAN
Heart rate speeds up to increase blood pressure back to normal
How do stimuli decrease blood o2 increase Co2 and decrease PH
Chemoreceptors detected chemical changes in the blood
Impulses are sent to the medulla which sends impulses along parasympathetic neurones
These secrete acetylcholine which binds to receptors on the SAN
Heart rate decreases to return O2 CO2 and PH levels back to normal
How do receptors detect low blood 02 high CO2 and low PH levels
Chemoreceptors in the carotid arteries and aorta detect chemical changes in the blood
Impulses are sent to the medulla which sends impulses along the parasympathetic neurones
These secrete noradrenaline which binds to receptors on the SAN
Heart rate increases to return 02 CO2 and PH levels back to normal
What is the effector involved in the control of heart rate
Cardiac muscles
