exercise and the heart rate Flashcards
(14 cards)
What does the increase in respiration increase the production of?
Carbon dioxide
What does this do to the blood?
Lowers its pH
What is stimulated when this happens?
Chemoreceptors
Where are these found?
Aortic and carotid bodies
What do these do?
Transmit more impulses to the medulla
How does the medulla respond?
Transmitting more sympathetic neurones to the SAN
What happens when the exercise has been completed?
Fewer impulses are transmitted from the chemoreceptors to the medulla
What happens to blood pressure during exercise?
It increases and muscles contract strongly
What does an increased blood flow do to the heart?
Causes the cardiac muscles to contract more strongly so a higher volume of blood is output
What is this also known as?
An increase in stroke volume
What is an increase in pressure detected by?
Pressure receptors
Where are these located?
Aorta and carotid artery
What happens to these receptors when the pressure increases?
They send more impulses to the medulla stimulating the cardioinhibitory centre and inhibiting the cardioacceleratory centre
Where do these impulses go?
Along parasympathetic neurones to the SAN
