2. CV Function Flashcards
What happens to the blood that is leftover from net filtration and reabsorption?
Goes to the lymph system
How does plasma volume shift w/ weight training?
Plasma volume drops by 20% at onset of lifting, then fluid moves back into circulatory system after about an hour
Equation for blood flow to an organ
Q(organ) = ΔP/R(organ)
- ΔP = pressure driving it in vs. pressure at the end of the organ
- R(organ) = summed resistance of all vasculature
Flow rate in a parallel resistance network
Can tailor flow to specific tissues and organs b/c of different resistances
Flow rate in a series resistance network
- Flow rate is dictated by highest resistance (narrowest tubes)
- Pressure diminishes further down series –> organs later in series unhappy b/c less pressure = less flow to organ
What is total peripheral resistance?
Summed resistance to forward flow in systemic circulation
Equation for MAP
MAP = 2/3 DBP + 1/3 SBP
What is the highest blood pressure heard? Lowest?
- Highest = systolic
- Lowest = diastolic
Equation for cardiac output of the CV system
Qsystem = MAP/TPR -MAP = ΔP(a-v)
What causes cardiogenic shock?
Myocardial failure
What causes hypovolemic shock?
Fluid loss
What causes anaphylactic/septic shock?
Vasodilator release
What causes neurogenic shock?
Decrease in sympathetic nerve activity
Is there a diff in flow rate though the left vs. right sides of the heart?
No, they are equal
What is the relative pressure and resistance in systemic circulation?
- High pressure (avg ~100 mmHg)
- High resistance to flow
