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If the pressure in the esophagus is −2.00 mm Hg while that in the stomach is +20.0 mm Hg, to what height could stomach fluid rise in the esophagus, assuming a density of 1.10 g/mL? (This movement will not occur if the muscle closing the lower end of the esophagus is working properly.)

What is the maximum height stomach fluid could rise in the esophagus based on the given pressures and fluid density?

A. 22.00 cm
B. 18.18 cm
C. 16.36 cm
D. 25.45 cm

User EvilZebra
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1 Answer

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Final answer:

Using hydrostatic pressure calculations and converting units accordingly, the maximum height fluid could rise is found to be around 27.23 cm. The closest given option is D. 25.45 cm, as the exact calculated value is not an option.

Step-by-step explanation:

To calculate the maximum height stomach fluid could rise in the esophagus based on the given pressures in the esophagus and stomach and the fluid density, we start with the pressure difference, which is the pressure in the stomach (+20.0 mm Hg) minus the pressure in the esophagus (-2.00 mm Hg), yielding a net pressure of 22.0 mm Hg. This pressure is responsible for pushing the stomach fluids up the esophagus when the lower esophageal sphincter is not closed properly.

To find the height to which this pressure can raise the fluid, we use the formula for hydrostatic pressure P = ρgh, where P is the pressure, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the height of the fluid column. We can rearrange this to solve for h: h = P / (ρg).

First, we convert the fluid density to kg/m³ (1 g/mL = 1000 kg/m³), so we have a density of 1.10 g/mL = 1100 kg/m³. We also need to convert the pressure from mm Hg to pascals using the conversion 1 mm Hg = 133.322 Pa, so 22.0 mm Hg = 2933.084 Pa. Using the acceleration due to gravity g = 9.81 m/s², we have:

h = 2933.084 Pa / (1100 kg/m³ * 9.81 m/s²) = 0.2723 m or 27.23 cm

However, none of the options exactly match this calculation. The closest option is D. 25.45 cm, which could result from rounding errors or environmental variations not considered in this idealized scenario. Thus, the maximum height stomach fluid could rise, as per the choices, is 25.45 cm, represented by option D.

User Diverti
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