Physiology and Hemodynamics Flashcards
Each beat pumps about how many milliliters of blood into the aorta causing a blood pressure pulse?
70mL
Increase heart rate delivers an increased blood what?
volume
Cardiac output determines the amount of blood entering arterial system; arterial pressure and total _____, determines the amount that leaves it?
peripheral resistance
Concerning flow, lower resistance = ________ and higher resistance = __________
high flow rate and low flow rate
The total energy contained in moving fluid is the sum of _____, ______, and ________ energies?
pressure, kinetic, and gravitational
What is another name for pressure energy?
Potential or Stored
What is the major form of energy (E) for circulation of blood?
Pressure (potential/stored) energy.
________ is equivalent to the weight of the column of blood extending from the heart to the level where pressure is measured?
Hydrostatic Pressure.
A ________ is needed to moved blood from one point to another. The greater the _______, the greater the flow?
Energy Gradient.
Resistance id directly proportional to variables in numerator :(______ and ______)
Viscosity and Length
Although viscosity and vessel length have an effect on resistance, a change in vessel _______ has a more dramatic effect.
Diameter.
If viscosity increases, velocity ______
decreases.
If viscosity decreases, velocity ________
increases.
Poiseuille’s Equation defines the relationship between: _____, ______, and _______
pressure, volume flow, and resistance.
Poiseuille’s Equation also helps define how much __________ moves through a vessel.
fluid volume.
What is Poiseuille’s Equation?
Q=P/R
Q-Volume Flow, P-Pressure, R-Resistance
_______ change has the most dramatic effect on resistance?
Diameter.
Radius of a vessel is _____ proportional to volume flow.
Directly.
Velocity and Pressure are _______ related?
Inversely.
What is the number in Reynold’s Number when laminar flow tends to become disturbed.
> 2000
Vasoconstriction- Pulsatile changes in medium/small sized arteries of the limbs are ______. When this occurs, pulsatility changes are usually ________ in the minute arteries.
Increased, Decreased.
Vasodilatation- Pulsatile changes in medium/small sized arteries of the limbs are _________. When this occurs , pulsatility changes are ________ in minute arteries.
Decreased, Increased.
