The effect of radius on flow rate The effect of radius on flow rate. Figure 3A: the fluid reservoir is placed on top of the bench to give a pressure head. This is connected to the flow module by rubber tubing with a clamp on it. A 5-mL volumetric flask is used to collect fluid, and the time taken with different diameter tubes is recorded on a stopwatch. (Figure 3B) The calculated flow rate plotted against the tube radius (r) as well as against r4. Interpret the graph Is the radius a variable that is likely to change to control blood flow to different tissues? How? What are the implications for the control of blood flow if it is proportional to the fourth power of a variable?
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
The effect of radius on flow rate
The effect of radius on flow rate. Figure 3A: the fluid reservoir is placed on top of the bench to give a pressure head. This is connected to the flow module by rubber tubing with a clamp on it. A 5-mL volumetric flask is used to collect fluid, and the time taken with different diameter tubes is recorded on a stopwatch. (Figure 3B) The calculated flow rate plotted against the tube radius (r) as well as against r4.
- Interpret the graph
- Is the radius a variable that is likely to change to control blood flow to different tissues? How?
- What are the implications for the control of blood flow if it is proportional to the fourth power of a variable?
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