Flashcards in Unit 2 Deck (194)
_______ velocity of blood flow
Lots of ______, _____ and _____ muscle
Functions as a ______ (resistance to flow doesnt change much
High velocity of blood flow
Lots of elastin, collagen and smooth msucle
Functions as a conduit
_______ control flow into capillaries and are the MOST important determinant of PERIPHERAL RESISTANCE
What is the most important determinant of peripheral resistance?
Arterioles contains much ____ muscle and can change ______
_____ function to exchange fluid, nutrients, electrolytes, hormones, etc to tissue cells.
Thin walled and no muscle
Veins and venules have _____ pressure
Thin walls that are ________
The total cords-sectional area is the sum of the individual ______ area of each ______ category
Even though capillaries have the ______ diameter individually, they have the _______ cross-sectional area
Smallest; largest combined
Most of the blood volume is in the _______ system
Veins and venules are considered to be the _________
As total cross-sectional area increases, blood flow velocity _______
(V=Q/A or V= F/A)
What is total cross sectional area?
The sum of the individual cross sectional areas of each blood vessel category
Capillaries have the smallest ______ individually and the largest combined
Diameter; cross sectional area
Blood flow (_or _) is the same or different? For each section of the circulation
Q or F; is the same for each section of circulation
Pressure in arteries is ____
Pressure in the capillaries averages about _____ mmHg
Pressure in venous system is ____
High; 17; low
What is Ohm’s law?
**algebraic rearrangement of this equation also hold true:
Delta P= QxR
R= delta P/Q
Blood flow (Q)= (P1-P2)/R is what equation?
Basic flow equation
AKA ohm’s law
Blood flow (Q) means what?
The volume of blood that passes a given point per unit of time
Ex: Liters per min
Cardiac output (CO) is what? And that is the typical caridac output
Q for the entire systemic circulation and typically is about 5 L/min
Explain laminar flow
Flow in layers
Parabolic shape of velocities
Explain turbulent flow
Layers are disrupted by some partial obstruction or excessive velocity
What is a carotid bruit?
Atherosclerotic plaques partially occluded an artery causing turbulent flow
When measuring blood pressure, cuff pressure should be ________ when inflated. One slowly let air out of cuff, between 80 and 120, will revive b
When the cuff is inflated so that it sto[s arterial blood flow. No sound can be heard through a stethoscope placed over the brachial artery distal to the cuff
Korotkoff sounds are created by pulsatilla blood flow through the compressed artery
Blood flow is silent when the artery is no longer compressed
What can be used to determine turbulent flow?
When Reynolds number rises above ______, turbulence is likely
Turbulence often occurs in the _______ due to pulse and changes in vessel diameter during ejection
T/F: Turbulence normally occurs in smaller vessels
F: turbulence normally doesn’t occur in smaller vessels
What is used to relate radius, viscosity and length to blood flow?
Q= delta P x pie x r^4 / 8 n l
The total resistance of vessels in series is equal to the ________
Sum of their individual resistances