40 Questions
What is the unit of pressure in medicine?
Height of a column of mercury
What is the force per unit area in a solid referred to as?
Stress
What is the unit of pressure in the formula P = F / A?
All of the above
What is the formula to calculate the pressure P under a column of liquid?
P = ρ gh
What is the acceleration due to gravity in meters per second squared?
9.8 m/sec²
What is the density of water in kilograms per cubic meter?
1000 kg/m³
What is the value of 1 atmosphere in Newtons per square meter?
105 N/m²
What is the most common method of indicating pressure in medicine?
The height of a column of mercury
What is the density of mercury in g/cm3?
13.6
What is the unit of pressure in the equation P = ρgh?
Dy/cm2
What type of pressure is the excess pressure over the atmospheric pressure?
Gauge Pressure
What is the pressure in N/m2 for a systolic pressure of 120 mmHg?
1.6x104
What is the height of water that would produce the same pressure at 120 mmHg?
163 cmH2o
What type of pressure is lower than atmospheric pressure?
Negative Pressure
What is the pressure in a person's mouth when they drink through a straw?
Negative Pressure
The pressure of a column of mercury is equal to the patient's systolic blood pressure at its base.
True
A column of water would have to be 13.6 times lower than a column of mercury to produce the same pressure.
False
Gauge pressure is the same as absolute pressure.
False
The pressure in the lungs during inspiration is a few centimeters of water positive.
False
P = ρgh is the formula to calculate the pressure of a solid.
False
What is the minimum depth of water that can cause an eardrum to rupture due to pressure differential?
1.7 m
What is the effect of cold water in the middle ear after an eardrum rupture?
Nausea and dizziness
What is the result of breathing air at a depth of 30 m?
Nitrogen narcosis
What law explains the amount of gas that dissolves in a liquid?
Henry's law
What is the condition caused by the sudden decrease in pressure when a diver ascends?
Bends
What happens to the extra nitrogen in the tissues when a diver ascends?
It is dissolved in the blood and removed slowly
What is the cause of the bends in diving?
The sudden decrease in pressure during ascent
What happens when a diver ascends too quickly?
Bubbles form in the tissues and joints
What is the name of the condition that causes nausea and dizziness in divers?
Vestibular effect
Why is it dangerous to breathe air at a depth of 30 m?
The nitrogen is dissolved in the blood and tissues
A pressure differential of 120 mm Hg across the eardrum can cause the eardrum to rupture at a depth of 10 m of water.
False
Breathing air at a depth of 30 m can cause oxygen narcosis.
False
Henry's law states that the amount of gas that will dissolve in a liquid is inversely proportional to the partial pressure of the gas in contact with the liquid.
False
The bends occur because of a sudden increase in pressure when the diver ascends.
False
Nitrogen is transported by chemical attachment to red blood cells.
False
Cold water in the middle ear can affect the vestibular or balance mechanism and cause pain.
True
The eardrum can rupture due to a pressure differential of 100 mm Hg across the eardrum.
False
Decompression sickness is also known as diver paralysis.
True
Nitrogen narcosis is an ascent problem.
False
A pressure differential of 150 mm Hg across the eardrum can cause the eardrum to rupture.
True
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