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Science
Physics
Fluid Dynamics
Physiology Exam 4 Lecture 2
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Gravity
Lecture 2
Terms in this set (27)
The rate of blood flow to tissue is controlled by? what type of control?
tissue's metabolsim
intrinsic control
EDS (in or venous return)= ESV (out or cardiac output)
What is each controlled by?
1. EDS= blood volume drained from capillary beds controlled by tissue's metabolism
2. ESV= the sum of all capillary bed blood flow
Arterial pressure is independent of?
What type of control?
local control and cardiac output
extrinsic control
tunica intima= ?
tunica media= ?
tunica externa= ?
1. inner most layer, immediate contact with the blood, has endothelium
2. smooth muscle, adrenergic receptors, alpha-1= vasoconstrictor, beta-2= vasodilator
arteries or veins?
1. thick wall
2. thin wall
3. high pressure
4. low pressure
1. artery
2. vein
3. artery
4. vein
what happens when an artery vasocontricts?
it will push blood around and has a small diameter
what happens when a vein vasocontricts?
it will push blood to the heart with a larger diameter lowering the resistance
What does Ohm's law calculate?
Equation?
the blood flow which moves from high to low
I=P/R
What else can P stand for in Ohms law?
pressure 1- pressure 2
1= aortic pressure
2= right atrial pressure (0 mmHg)
What is the basic value for mean arterial pressure?
New equation for P?
120/80 systolic/diastolic
MAP-0
What are the 2 ways to calculate MAP?
1. take 1/3 of the pulse pressure (this is systolic- diastolic) + diastolic pressure
2. 0.4 systolic + 0.6 diastolic
What is the relationship with resistance and the blood vessel's diameter/radius?
inverse relationship
What is the relationship with resistance and conductance?
inverse relationship
The larger the radius, the _____ the conductance, and the _____ the resistance.
larger
smaller
I= P/R
what happens when:
p increase
r decreases
p decreases
r increases
1. I increases
2. I increases
3. I decreases
4. I decreases
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Verified questions
PHYSICS
Suppose that you hold up a small convex mirror in front of your face. Which answer describes the image of your face? (a) Virtual, inverted (b) Virtual, upright (c) Virtual, enlarged (d) Real, inverted (e) Real, reduced in size
PHYSICS
Stellar system $$ Q_1 $$ moves away from us at a speed of 0.800c. Stellar system $$ Q_2 $$ , which lies in the same direction in space but is closer to us, moves away from us at speed 0.400c. What multiple of c gives the speed of $$ Q_2 $$ as measured by an observer in the reference frame of $$ Q_1 $$ ?
PHYSICS
We know that the charge on a conductor goes to the surface, but just how it distributes itself there is not easy to determine. One famous example in which the surface charge density can be calculated explicitly is the ellipsoid: $$ \dfrac{x^2}{a^2}+\dfrac{y^2}{b^2}+\dfrac{z^2}{c^2}=1 $$ In this case $$ \sigma=\dfrac{Q}{4\pi abc}\bigg{(}\dfrac{x^2}{a^4}+\dfrac{y^2}{b^4}+\dfrac{z^2}{c^4}\bigg{)}^{-1/2} $$ where Q is the total charge. By choosing appropriate values for a,b, and c, obtain: (a) the net (both sides) surface charge density $\sigma(r)$ on a circular disk of radius R; (b) the net surface charge density $\sigma(x)$ on an infinite conducting "ribbon" in the xy plane, which straddles the y axis from x=-a to x=a (let $\Lambda$ be the total charge per unit lenght of ribbon); (c) the net charge per unit lenght $\lambda(x)$ on a conducting "needle", running from x=-a to x=a. In each case, sketch the graph of your result.
PHYSICS
In a certain solar house, energy from the Sun is stored in barrels filled with water. In a particular winter stretch of five cloudy days, $$ 1.00 × 10^6 kcal $$ is needed to maintain the inside of the house at 22.0°C. Assuming that the water in the barrels is at 50.0°C and that the water has a density of 1.00 × 10³ kg/m³, what volume of water is required?
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