Chapter 4: Flashcards
Define hydrostatic pressure:
The pressure exerted by a fluid, at a given point in the fluid, due to the force of gravity. This is the pressure created on a blood vessel, from the blood flowing within it.
If the hydrostatic pressure of a blood vessel that supplies an organ, which of the following would occur?
a. The oncotic pressure will increase.
b. The organ will increase in mass and weight.
c. The blood flow to the orgall decreases.
d. The oncotic pressure will decrease.
b. The organ will increase in mass and weight - because as hydrostatic pressure increases, more fluid will leave the blood vessel and enter the organ tissue.
d. The oncotic pressure will decrease -
What does oncotic pressure do physiologically?
Pull water back into the bloodstream, thanks to the concentration of large solutes (albumin) in the plasma.
Pressure in a blood vessel:
P = pgh
p = density of a fluid.
g = acceleration due to gravity.
h = height.
When arterial pressure and venous pressure are equal:
a. The venous return from the supplied tissue will increase.
b. The volume of blood supplied to the tissue will increase.
c. The flow of blood between the blood vessels and tissue will be almost 0.
d. The flow of blood through the vessels will halt, and there will be no oxygenation of tissues.
c - The blood flow between the blood vessels and tissue will be almost 0.
When arterial = venous, there is no net change in blood exchange between a vessel and its target tissue.
An incompressible solid plastic bowling ball with a density of 1.32 g/cm^3 is held at a depth of 10 m in a freshwater lake. When released, the ball will:???????????????
a. Sink with an initial velocity of 3.3 m/s.
b. Sink with an initial acceleration of 2.5 m/s.
c. Sink with an initial acceleration of 9.8 m/s^2.
d. Float upward with with an initial velocity of 3.3 m/s.
Sink with an initial acceleration of 2.5 m/s.
Since the ball is more dense than water, it will sink.
a = (Fg - Fb)/m
Fq = mg = (mvol)(9.8) – Mass and volume of ball.
Fb = mg = (mvol)(9.8) — Mass and volume of water.
What is the density of water?
1 g/cm^3
- Heart to lungs - Blood raises up slightly, causing an increase in gravitational potential energy.
- As blood goes back to the heart it will go back to the initial gravitational potential energy.
- As blood leaves the heart and goes up the aorta, the gravitational potential energy will slightly increase.
- As blood leaves the aorta and goes into peripheral vessels, the gravitational potential energy will drastically decrease.
- As blood returns to the heart via venous return, gravitational potential energy is slowly (venous return is slow) increasing back to the initial gravitational potential energy.
DRAW OUT AS A GRAPH!
