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</p> Signup and view all the answers

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

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

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

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

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

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

    What is the density of mercury in g/cm3?

    <p>13.6</p> Signup and view all the answers

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

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

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

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

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

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

    What type of pressure is lower than atmospheric pressure?

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

    Gauge pressure is the same as absolute pressure.

    <p>False</p> Signup and view all the answers

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

    <p>False</p> Signup and view all the answers

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

    <p>False</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</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</p> Signup and view all the answers

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

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

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

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

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

    <p>Bends</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</p> Signup and view all the answers

    What is the cause of the bends in diving?

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

    What happens when a diver ascends too quickly?

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

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

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

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

    <p>False</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</p> Signup and view all the answers

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

    <p>False</p> Signup and view all the answers

    Nitrogen is transported by chemical attachment to red blood cells.

    <p>False</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</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</p> Signup and view all the answers

    Decompression sickness is also known as diver paralysis.

    <p>True</p> Signup and view all the answers

    Nitrogen narcosis is an ascent problem.

    <p>False</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</p> Signup and view all the answers

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