Systemic blood pressure is expressed as the ratio of the systolic pressure (when the heart first ejects blood into the arteries{max}) to the diastolic pressure (when the heart is relaxed{min}). Systemic pressure = Systolic pressure / diastolic pressure. Both pressures are measured at the level of the heart and are expressed in millimeters of mercury although the units are not written. Normal systemic blood pressure is 120/80. What are the maximum and minimum forces (in Newtons) that the blood exerts against each square centimeter of the heart for a person with high blood pressure, 145 / 85 ? Note: this is a conversion question...follow the units. Answer to 2 sig figs. (1.013 x 10^5 N/m^2 = 760 mmHg =1 atm) (1m = 100 cm)
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.
Systemic blood pressure is expressed as the ratio of the systolic pressure (when the heart first ejects blood into the arteries{max}) to the diastolic pressure (when the heart is relaxed{min}). Systemic pressure = Systolic pressure / diastolic pressure. Both pressures are measured at the level of the heart and are expressed in millimeters of mercury although the units are not written. Normal systemic blood pressure is 120/80. What are the maximum and minimum forces (in Newtons) that the blood exerts against each square centimeter of the heart for a person with high blood pressure, 145 / 85 ?
Note: this is a conversion question...follow the units.
Answer to 2 sig figs. (1.013 x 10^5 N/m^2 = 760 mmHg =1 atm) (1m = 100 cm)
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