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Physio II

Question 1 of 8

1

Intercostal muscles are the most important muscles of respiration

Select one of the following:

  • True
  • False

Explanation

Question 2 of 8

1

Muller's maneuver measures maximum inspiratory pressure (MIP) developed against a block of the trachea at RV

Select one of the following:

  • True
  • False

Explanation

Question 3 of 8

1

Valsalva maneuver measures Expiratory muscle strength - measures maximum expiratory pressure (MEP) at RV

Select one of the following:

  • True
  • False

Explanation

Question 4 of 8

1

Cough - which statement is wrong

Select one of the following:

  • Sensory reflex loop - RARs (rapidly adapting receptors) detect irritants and stimulate trigeminal nerve -> brain stem -> motor neurons ->respiratory muscle contractions

  • Sequence - deep inhalation -> forced expiration on closed glottis -> open glottis forced espiration

  • 3 most common cause of chronic cough (> 8 weeks) post nasal drip from rhinosinusitis, asthma and GERD

  • Reaches a speed of 28,000 cm/sec, eject about 40,000 microdroplets which may contain >200,000 virus particles

Explanation

Question 5 of 8

1

Airflow and respiratory pressures are measured in cm of H2O because the pressure changes in the lung are so small that it is hard to see a 1 or 2 mmHg change

Select one of the following:

  • True
  • False

Explanation

Question 6 of 8

1

Regarding pressures all of the following are true except

Select one of the following:

  • P(alveolar) = P(barometric) at end inspiration and end expiration

  • P(alveolar) = P(Barometric) here is no air flow and glottis is closed

  • When P(alveolar) > P(barometric) the direction of airflow is - out of lungs (expiration)

  • PL = PA-Ppl

Explanation

Question 7 of 8

1

During Respiration the following is the sequence except

Select one of the following:

  • Inspiratory muscles contract -> thoracic cavity expands

  • Pleural pressure becomes more negative (-5 to -8 cm of H2O)

  • Transpulmonary pressure decreases

  • lungs inflate and alveolar pressure becomes subatmospheric --> air flows into the lungs until alveolar pressure equals atmospheric pressure

Explanation

Question 8 of 8

1

Boyles law

Select one of the following:

  • P1V1 = P2V2

  • During inspiration Alveolar Pressure drops and volume increases

  • During inspiration Pleural pressure increases (becomes more negative) and volume decreases

  • 1,2,3 are correct

  • 1,2 are correct

  • 2,3 are correct

Explanation

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