To first approximation, we can ignore the flow of blood through the human circulatory system and treat it as a static fluid. Supposed you can measure a person’s blood pressure in both their anterior tibial artery (Pt, in the lower leg) and in their aorta (Pa, near the heart). Calculate the difference between Pt and Pa (i.e. Pa - Pt), in Pascals, when the person is lying down, and the person is standing. Use the fact that the distance between the two locations is approximately 1.35 m and the density of blood is 1060 kg/m3.
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.
To first approximation, we can ignore the flow of blood through the human circulatory system and treat it as a static fluid. Supposed you can measure a person’s blood pressure in both their anterior tibial artery (Pt, in the lower leg) and in their aorta (Pa, near the heart). Calculate the difference between Pt and Pa (i.e. Pa - Pt), in Pascals, when
-
the person is lying down, and
-
the person is standing.
Use the fact that the distance between the two locations is approximately 1.35 m and the density of blood is 1060 kg/m3.
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