Blood Pressure Lecture Flashcards
1
Q
Blood pressure is
A
Pressure blood exerts against the arterial wall
2
Q
in blood pressure, pressure is higher in
A
systemic arteries (left ventricle)
3
Q
high blood pressure is more dangerous why
A
- constant prolong = walls thicken up outwards and inwardly
- acute – tears in lining
4
Q
low bp is not dangerous until
A
- until theres no hydrostatic pressure then filtration doesn’t occur/ go into shock
5
Q
Negative feedback loop for
BP =
A
BP = HR SV TPR
6
Q
HR
A
heart rate
7
Q
SV
A
stroke volume
8
Q
TPR
A
total peripheral resistance
9
Q
stroke volume
A
volume of blood injected from the ventricles in one contraction
10
Q
total peripheral resistance
A
- blood vessel
- resistance to blood flow
- vasoconstriction and dilation
- size of lumen of blood vessel determines TPR
11
Q
vasoconstriction in TPR
A
- Increases TPR resistance to blood flow
12
Q
vasodilation (TPR)
A
decreases resistance to blood flow (TPR goes down)
13
Q
sensors for BP
A
baroreceptors
14
Q
baroreceptors
A
- stretch receptors: goes down low bp/ goes up up BP
- cranial nerve
15
Q
Integrating center for BP = Medula
A
- cardiac control center
2. vasomotor center
