Neural Influences Flashcards
- Vascular smooth muscle
- Vasoconstriction
- Alpha 1
- Alpha 2
- Endothelial Cell
- Vasodilates
- Alpha 2 via NO
- Cardiac muscle
- NE -> Positive introphic and chronotrophic effect
- Beta 1
- Vascular smooth muscle
- Circulating EPI
- Vasodilates
- Beta 2
Vasodilation → ↓ SANS → upstream pressure and downstream pressure?
- ↓ upstream pressure → ↑ downstream pressure
Vasconstriction → ↑ SANS → upstream and downstream pressure?
- ↑ upstream pressure → ↓ downstream pressure
Exercise → ↑SANS → upstream and downstream pressure?
- ↑ upstream pressure → ↓ downstream pressure → ↑ venous return
↑ arteriolar tone → arteriolar resistance → forward movement of blood → peripheral driving pressure →
in venous return
- ↑arteriolar resistance → ↓ forward movement of blood → ↑ peripheral driving pressure → ↓ venous return
Start to Point A
- Venoconstriction
Start to Point B
↑ arteriolar tone → diastolic pressure?
- ↑ diastolic pressure
↓ arteriolar tone → diastolic pressure?
- ↓ diastolic pressure
Venoconstriction→ venous return→ end diastolic blood volume → stroke volume → cardiac output
↑ venous return→ ↑ end diastolic blood volume → ↑ stroke volume → ↑ cardiac output
↓ venous tone → systolic pressure?
- ↓ systolic pressure
↑ venous tone → systolic pressure?
- ↑ systolic pressure
Venoconstriction affects systolic blood pressure (PS)
↑ venous return → end diastolic blood volume → stroke volume→ cardiac output → blood volume in arteries → pressure on wall of vessels during systole
- ↑ venous return → ↑end diastolic blood volume → ↑ stroke volume→ ↑ cardiac output → ↑ blood volume in arteries → ↑ pressure on wall of vessels during systole
Vasoconstriction affects diastolic blood pressure (PD)
↑ peripheral arteriolar resistance → blood volume in arteries → pressure on wall of vessels during diastole
↑ Peripheral arteriolar resistance →↑ blood volume in arteries → ↑ Pressure on the wall of vessels during diastole, which raises diastolic pressure.
