CH 22: Respiratory System

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  1. What are the seven functions of the respiratory system?
    • 1- Provide O2 and CO2 exchange
    • 2- Serves for speech and other vocalizations
    • 3- provides sense of smell
    • 4- helps control pH by eliminating CO2
    • 5- Lungs help produce angiotension II (helps regulate BP)
    • 6- Change in pressure gradients via breathing promotes lymph and venous blood flow
    • 7- Holding breath helps expel abdominal contents in urination/defecation/childbirth
  2. True or false: The nose helps humidify inhaled air.
    True!
  3. How many lobes do the lungs have?
    The right lung has three lobes, the left lobe has two lobes.
  4. What is pulmonary surfactant?
    It is secreted by squamous alveolar cells and helps prevent bronchioles/alveoli from collapsing during exhale.
  5. What are three functions of pleauae and fleural fluid in the lungs?
    • 1- Reduction of friction
    • 2- Creation of pressure gradient
    • 3- Compartmentalization
  6. The ______ accounts for about 2/3 of the pulmonary air flow.
    Diaphragm
  7. Breathing in has what effect on abdominal pressure?
    As the lungs inflate, pressure in the thoracic cavity decrease and pressure in the abdominal cavity increases.
  8. What is average atmospheric pressure?
    760 mmHg (1 ATM). The weight of the air above us.
  9. What is air composed of?
    78.6% nitrogen, 20.9% oxygen, 0.04% carbon dioxide.

    Argon, neon, helium, methane and ozone (alone with water vapor) are also in the air in smaller amounts.
  10. After oxygen is inhaled, how is it transported throughout the body?
    Most of it is bound to hemoglobin. Each hemoglobin has four globins that can carry four oxygens.
  11. What is the normal arterial PO2?"
    95 mmHg
  12. A blood pH lower than ____ is acidosis, and greater than ___ is called alkalosis.
    • a- 7.35
    • b- 7.45
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318051
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CH 22: Respiratory System
Description
CH 22 Respiratory system pg 863
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