Neurohumeral Influences Flashcards
Parasympathetic stimulation (cholinergic): Control located in \_\_\_\_\_\_\_ \_\_\_\_\_\_, \_\_\_\_\_\_\_\_\_\_ center
Medulla oblongata
CardioINHIBITORY
Parasympathetic stim:
Via what nerve and what plexus?
Vagus nerve
Cardiac plexus
Parasympathetic stim: Vagus nerve and cardiac plexus innervate what?
What NT does it release?
SA node
AV node
Sparsely the myocardium
ACh
Parasympathetic stim:
Slows rate and force of ________ contraction
Decreases ________ ________
Myocardial
Myocardial metabolism
Parasympathetic stim:
Causes coronary artery __________
VASOCONSTRICTION
Sympathetic stim (Andrenergic): Where are the control centers located?
Medulla oblongata, cardioACCELETORY center
Sympathetic stim (Andrenergic):
Via cord segments __________
Upper ______ and ______ chain ganglia
T1-T4 (in neuro section says T1-L2)
Thoracic and cervical
Sympathetic stim (Andrenergic):
Innervate _______, ______, ______ ______, and _______
Releases what 2 NT
SA node
AV node
Conduction pathways
Myocytes
Epinephrine
Norepinephrine
Sympathetic stim (Andrenergic): Causes an increase in the rate and force of \_\_\_\_\_\_ contraction and \_\_\_\_\_\_\_\_
Myocardial
Metabolism
Sympathetic stim (Andrenergic): Causes coronary artery \_\_\_\_\_\_\_\_
Vasodilation
Sympathetic stim (Andrenergic): the skin and peripheral vasculature receive only _____ ____________ sympathetic innervation
Causes _________ of cutaneous arteries
Sympathetic inhibition must occurs for ___________
Post ganglionic
Vasoconstriction
Vasodilation
Coronary artery vasoconstriction: ___
Coronary artery vasodilation: ___
PNS
SNS
Drugs are increase sympathetic functioning are _____
Drugs that decrease it are _____
Sympathomimetics
Sympatholytics
What are the main mechanisms controlling HR?
Barareceptors (pressoreceptors)
Where are baroreceptors located?
In walls of aortic arch and carotid sinus — via vasomotor center
Circulatory reflex responds to changes in ___ ____
Blood pressure
Increased BP results in __________ stimulation
Decreased ____ and ______ of cardiac contraction
_________ inhibition
Decreased ______ resistance
Parasympathetic
Rate and force
Sympathetic
Peripheral
Decreased BP results in _________ stimulation
Increased ___ and ____
And _________ of peripheral blood vessels
Sympathetic
HR and BP
Vasoconstriction
Inc RA pressure causes ____ ______ of HR
Reflex acceleration
Chemoreceptors are located in ____ ______
They are sensitive to changes in blood chemicals including ___, ____, and ___ ____
Carotid body
O2, CO2, lactic acid
Increased ____, or decreased ____, or decreased ____ (elevated ____ ____ would result in an increase in HR
CO2
O2
PH
Lactic acid
Increased ____ levels results in decrease in HR
O2
Increased body temp causes HR to ________
Increase
Decreased body temp causes HR to ______
Decrease
