Blood Pressure Lecture Flashcards
Blood pressure is
Pressure blood exerts against the arterial wall
in blood pressure, pressure is higher in
systemic arteries (left ventricle)
high blood pressure is more dangerous why
- constant prolong = walls thicken up outwards and inwardly
- acute – tears in lining
low bp is not dangerous until
- until theres no hydrostatic pressure then filtration doesn’t occur/ go into shock
Negative feedback loop for
BP =
BP = HR SV TPR
HR
heart rate
SV
stroke volume
TPR
total peripheral resistance
stroke volume
volume of blood injected from the ventricles in one contraction
total peripheral resistance
- blood vessel
- resistance to blood flow
- vasoconstriction and dilation
- size of lumen of blood vessel determines TPR
vasoconstriction in TPR
- Increases TPR resistance to blood flow
vasodilation (TPR)
decreases resistance to blood flow (TPR goes down)
sensors for BP
baroreceptors
baroreceptors
- stretch receptors: goes down low bp/ goes up up BP
- cranial nerve
Integrating center for BP = Medula
- cardiac control center
2. vasomotor center
cardiac control center
- cardiac acceleratory center (CAC): increase HR and Increase SV
- Cardiac Inhibitory center(CIC): decrease HR; decrease SV
Vasomotor center
- vasoconstrictor increase TPR
- Vasodilator decrease TPR
Effectors for BP
- Pacemaker of Heart = SA & AV nodes (HR)
- Myocardium (SV) (how forcefully contract determine blood volume)
- Blood Vessels (TPR)
HR - Autonomic Nervous System
- Sympathetic division
2. Parasympathetic division
sympathetic division
- flight or flight (also turns on during stress, ex. exercise)
what happens when sympathetic division is on
- blood is shunted away from viscera by constricting towards brain and skeletal muscles
parasympathetic division
- rest and digest system
what happens when parasympathetic division is on
blood is shunted away from brain and skeletal muscles towards viscera
