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no gas flow is equal to pressure gradient over resistance
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Resistance to blood flow depends mainly on?
ultra filtration pressure in the capillaries
What are the normal values for alveolar pressure?
For air flow: F=(P_alveolar -P_atmosphere)/R When there is no air flow F= 0 and then P_alveolar -P_atmosphere=0, so they equal each other. Hence the Alveolar pressure is equal to that of the atmosphere, between a breathing cycle.
How is the concentration gradient of a substance important to diffusion?
In diffusion, substances flow with a concentration gradient, meaning that they flow from areas of high concentration to areas of lower concentration. Flowing against a concentration gradient would be going from an area of low concentration to an area of higher concentration, but this only occurs in active transport.
What is water potential gradient?
similar to potential energy, water flows down a gradient from higher potential to lower potential. Higher potential is generally in the soil/roots and lower potential is at the leaves/atmosphere. The water has potential to flow down the gradient
What equation relates to flow pressure and resistance to define mean arterial pressure?
the equation for mean arterial pressure is MAP=(1/3) PP (pulse pressure) + Diastolic example: if someone's blood pressure is 125/65, then Pulse Pressure is 60 now that you have this info you can calculate MAP (mean arterial pressure) MAP= (1/3) 60 + 65 MAP= 85
Why do winds not simply flow down a pressure gradient?
Why don't winds simply flow down a pressure gradient?
What is the driving force for fluid flow?
pressure gradient is
What force causes the bulk flow of fluids?
Pressure Gradient
What conditions must be present for a fluid to flow?
pressure gradient
What happens to the current if restistance is increased and why?
There is an electronic formula voltage/resistance = current If you translate this into plumbing terms voltage would equal water pressure resistance would equal pipes and valves and the current would equal the flow rate. If you start closing a valve it increases resistance and lowers the current flow
Does pump create pressure?
No. Pumps create flow. Resistance to flow creates pressure.
What type of gradient is involved in the pressure flow theory of phloem transport?
The pressure-flow hypothesis explains the function of pholem because ONE DIRECTION IS THE BEST
What forces influences upper air wind flow when a gradient wind is dominant?
Pressure gradient force and coriolis force.
The pressure gradient force causes air to flow from areas of relatively pressure to areas of relatively pressure?
high to low
What is a pressure gradient and how is it related to air movement?
Pressure gradient is the rate of pressure change as you change position, not just the difference between the lowest pressure and the highest pressure, but how great (or small) the physical distance between them. Since it the pressure difference that make air flow (wind) the greater the pressure gradient, the greater the wind.
What are pressure reservoirs with low resistance to flow?
the arteries
What is the principles relating to blood flow and pressure and resistance?
Blood pressure = (Blood flow)(Resistance). This equation is usually found in the following form: MAP = (CO)(R) Where MAP is the mean arterial pressure CO is the cardiac output R is the peripheral resistance
