01: Hemodynamics Flashcards
Pressure drops (a lot/very little) in large arteries, where resistance is (high/low).
Very little; low
Pressure drops (a lot/very little) in arterioles, where resistance is (high/low).
A lot; highest in circulation
(X) vessels in circulatory system act as stop-cocks or faucets.
X = arterioles
Velocity is lowest in which vessels of circulatory system? This is because (X) is (highest/lowest) in these vessels.
Capillaries;
X = cross-sectional area
Highest
(X) are the “capacitance vessels” of the circulatory system. This is because they carry (high/low) amount of blood at (high/low) P.
X = veins and venules
High; low
Cardiac Output of (L/R) sides of heart is greater.
Must be equal (in steady state)
Compliance is (directly/indirectly) related to:
Directly: change in volume
Indirectly: change in P
(Veins/arteries) have greater compliance and thus (larger/smaller) slope on Pressure v Volume graph.
Veins;
larger
(X)% of blood at given time is in systemic circulation. And (Y)% is collected in veins.
X = 75 Y = 50-60
Flow of systemic circulatory system depends on (X) and (Y) factors hypothetically, but really, it only depends on (X/Y) because…
X = pressure difference (between veins and arteries) Y = resistance of organ
Y; P in arteries/veins is the same for every organ
Bernoulli said that total energy (in real fluid) can be of which forms? Star the ones that are interchangeable.
- Ep*
- Ek*
- Eg*
- Er
According to Bernoulli, flow in a tube occurs when there’s (X) of (Y).
X = gradient Y = total fluid energy between points along a the tube
Bernoulli: If tube diameter is uniform, what can you say about flow and velocity? Which form of energy is constant?
Flow is same in all parts of tube; velocity is constant, so Ek must be constant
Bernoulli: narrowing of the tube results in (increase/decrease) Ek and, thus, a(n) (increase/decrease) in Ep. How is Er affected?
Increase; decrease;
Er increases (more E lost as heat)
The Reynolds number predicts:
the probability of turbulence
