Regulation of Cardiac Activity Flashcards
what is Franks-Sterling of the heart?
the more the heart fills with blood during diastole the more forceful it contracts during systole
the extrinsic regulation is controlled by the what?
autonomic nervous system
which NS branch controls heart rate?
sympathetic increases, parasympathetic decreases
what is in the CNS?
cardiovascular centers
what are the 3 primary clusters of nerves within the medulla oblongata?
cardioaccelerator, cardioinhibitory, vasomotor centers
what do cardioaccelerator centers do?
stimulate cardiac function via sympathetic stimulation
what does the cardioaccelerator regulate?
heart rate and stroke volume
what is stroke volume?
amount of blood pumped by the left ventricle of the heart during one contraction
what do cardioinhibitory centers do?
slows cardiac function via parasympathetic stimulation
what does the cardioinhibitory center decrease?
heart rate and stroke volume
what does the vasomotor center do?
controls vessel tone or contraction of smooth muscle
why do cholinergic neurons release acetylcholine?
to stimulate vessels endothelium cells to release nitric oxide
why do adrenergic neurons release norepinephrine?
to bind to B1 adrenergic receptors to stimulate vessel tone
what are baroreceptor receptors?
specialized stretch receptors located within blood vessels and chambers of the heart
where are baroreceptor receptors located?
in the sinuses within the aorta and carotid
T/F baroreceptor receptors respond to the degree of stretch of vessels due to blood pressure
True
what kind of feedback loop are baroreceptor receptors?
negative
