Respiratory System

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• Respiratory System

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Right lung Three lobes
Left lung Two lobes
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Help to clean air as it passes
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• Affects of smoking on respiration?
• What is Asthma?

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Vocal Folds
You dont have to know these terms!

• Functions
• Maintain an open passageway for air movement
  (thyroid and cricoid)
• Epiglottis and vestibular folds prevent swallowed
  material from moving into larynx
• Vocal folds are primary source of sound production

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Blood flow

• Major rout brings deoxygenated blood to the lungs
  via the pulmonary artery, to pulmonary
  capillaries, is oxygenated and returns to the
  heart through the pulmonary veins.

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Movement of air into and out of lungs

• Air moves from area of higher pressure to area of
  lower pressure
• Atmosphere has pressure (1 atm760 torr)
• When pressure inside thoracic cavity falls
  ________ 1 atm, air flows into lungs, (and vice
  versa)
• Pressure is inversely related to volume
• When the intercostal muscles and ________
  increase volume of thoracic cavity, pressure
  ____________.

below
diaphragm
decreases