Pressure

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Questions and Answers

What is the unit of pressure in medicine?

  • Newton per square meter
  • Height of a column of mercury (correct)
  • Pascal
  • Dynes per square centimeter

What is the force per unit area in a solid referred to as?

  • Tension
  • Force
  • Pressure
  • Stress (correct)

What is the unit of pressure in the formula P = F / A?

  • Pascal
  • Dynes per square centimeter
  • Newton per square meter
  • All of the above (correct)

What is the formula to calculate the pressure P under a column of liquid?

<p>P = ρ gh (C)</p> Signup and view all the answers

What is the acceleration due to gravity in meters per second squared?

<p>9.8 m/sec² (D)</p> Signup and view all the answers

What is the density of water in kilograms per cubic meter?

<p>1000 kg/m³ (C)</p> Signup and view all the answers

What is the value of 1 atmosphere in Newtons per square meter?

<p>105 N/m² (B)</p> Signup and view all the answers

What is the most common method of indicating pressure in medicine?

<p>The height of a column of mercury (A)</p> Signup and view all the answers

What is the density of mercury in g/cm3?

<p>13.6 (D)</p> Signup and view all the answers

What is the unit of pressure in the equation P = ρgh?

<p>Dy/cm2 (B)</p> Signup and view all the answers

What type of pressure is the excess pressure over the atmospheric pressure?

<p>Gauge Pressure (D)</p> Signup and view all the answers

What is the pressure in N/m2 for a systolic pressure of 120 mmHg?

<p>1.6x104 (D)</p> Signup and view all the answers

What is the height of water that would produce the same pressure at 120 mmHg?

<p>163 cmH2o (D)</p> Signup and view all the answers

What type of pressure is lower than atmospheric pressure?

<p>Negative Pressure (C)</p> Signup and view all the answers

What is the pressure in a person's mouth when they drink through a straw?

<p>Negative Pressure (B)</p> Signup and view all the answers

The pressure of a column of mercury is equal to the patient's systolic blood pressure at its base.

<p>True (A)</p> Signup and view all the answers

A column of water would have to be 13.6 times lower than a column of mercury to produce the same pressure.

<p>False (B)</p> Signup and view all the answers

Gauge pressure is the same as absolute pressure.

<p>False (B)</p> Signup and view all the answers

The pressure in the lungs during inspiration is a few centimeters of water positive.

<p>False (B)</p> Signup and view all the answers

P = ρgh is the formula to calculate the pressure of a solid.

<p>False (B)</p> Signup and view all the answers

What is the minimum depth of water that can cause an eardrum to rupture due to pressure differential?

<p>1.7 m (B)</p> Signup and view all the answers

What is the effect of cold water in the middle ear after an eardrum rupture?

<p>Nausea and dizziness (A)</p> Signup and view all the answers

What is the result of breathing air at a depth of 30 m?

<p>Nitrogen narcosis (A)</p> Signup and view all the answers

What law explains the amount of gas that dissolves in a liquid?

<p>Henry's law (B)</p> Signup and view all the answers

What is the condition caused by the sudden decrease in pressure when a diver ascends?

<p>Bends (D)</p> Signup and view all the answers

What happens to the extra nitrogen in the tissues when a diver ascends?

<p>It is dissolved in the blood and removed slowly (C)</p> Signup and view all the answers

What is the cause of the bends in diving?

<p>The sudden decrease in pressure during ascent (B)</p> Signup and view all the answers

What happens when a diver ascends too quickly?

<p>Bubbles form in the tissues and joints (A)</p> Signup and view all the answers

What is the name of the condition that causes nausea and dizziness in divers?

<p>Vestibular effect (D)</p> Signup and view all the answers

Why is it dangerous to breathe air at a depth of 30 m?

<p>The nitrogen is dissolved in the blood and tissues (A)</p> Signup and view all the answers

A pressure differential of 120 mm Hg across the eardrum can cause the eardrum to rupture at a depth of 10 m of water.

<p>False (B)</p> Signup and view all the answers

Breathing air at a depth of 30 m can cause oxygen narcosis.

<p>False (B)</p> Signup and view all the answers

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.

<p>False (B)</p> Signup and view all the answers

The bends occur because of a sudden increase in pressure when the diver ascends.

<p>False (B)</p> Signup and view all the answers

Nitrogen is transported by chemical attachment to red blood cells.

<p>False (B)</p> Signup and view all the answers

Cold water in the middle ear can affect the vestibular or balance mechanism and cause pain.

<p>True (A)</p> Signup and view all the answers

The eardrum can rupture due to a pressure differential of 100 mm Hg across the eardrum.

<p>False (B)</p> Signup and view all the answers

Decompression sickness is also known as diver paralysis.

<p>True (A)</p> Signup and view all the answers

Nitrogen narcosis is an ascent problem.

<p>False (B)</p> Signup and view all the answers

A pressure differential of 150 mm Hg across the eardrum can cause the eardrum to rupture.

<p>True (A)</p> Signup and view all the answers

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