Blood Pressure Flashcards
What are the barcoreceptors
Stretch receptors
Detect blood pressure
What would happen when the baroreceptors detect the increased blood pressure
They increase firing and would then allow the sympathetic stimulation to decrease
What innovates the SA and the AV. Node
The sympathetic and the parasympathetic systems
Where would the baroreceptors be
The aortic arch
The carotid sinus
What receptors does noradrenaline bind to for the increased heart rate and contraction.
The beta 1
What receptor does the noradrenaline bind to for the vasoconstriction
The alpha 1
What centre would control the vasoconstriction
The cardiac vasomotor centre
What would the adrenal medulla be innovated by
The sympathetic chain ganglia
Chromaffin cells would then release the adrenaline (80%) and the noradrenaline (20%)
What are the afferent fibres of the aortic arch barcoreceptors
The CN 10
What are the afferent fibres of the carotid sinus barcoreceptors
The CN 9
What are the parts of the vasomotor centre
C1 - vasoconstriction
A1 - vasodilation
Where do the CN 9 AND 10 get there information from
The nucleus of tractus solitarius
What is the nerve innovation for vasoconstriction
T1 to L2
What is the nerve innovation for the controls of the heart
Sympathetic form t1 to t5
What would stimulate the JG
Binding if the noradrenaline to the B1 receptors
Where would angiotensinogen be made
The liver (cleaved by renin)
Where would ACE be made
The lungs
What are the roles on ang 2
Vasoconstriction (increased systemic resistance)
Stimulates the hypothalamus thirst centre
Release of aldosterone from the Zona glomerulas
Release of ADH from the supraoptic region of the hypothalamus
How would the aqauporins be made
The ADH would bind to the V2 receptors in the collecting duct, this would then stimulate the aqauporins to be made
This would then allow the increased water uptake
Where would the aldosterone act
In the distal convoluted tubule
How would you Maintain hypotension in the short term
Reverse the sympathetic activity
Decreased ca2+
Open the k+ channels so the cell would hyperpolarise
How would hypertension be regulated in the long run
Increased atrial pressure, atria produce the atrial natriurtic peptide
What is the function of the atrial natriurtic peptide
Vasodilator - increased venous compliance - decreased venous pressure - reduced ventricle preload -lower cardiac output
Counteracts the RAAS system
