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The respiratory system by sujeet
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The respiratory system by sujeet


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  • 1. The Respiratory System Copyright Pearson Prentice Hall
  • 2. The Human RespiratorySystem Pharynx Nose Larynx Mouth Trache aLungs Epiglottis Bronchus Bronchioles Diaphragm Copyright Pearson Prentice Hall
  • 3. What Is Respiration?What Is Respiration? In biology, respiration means different things. Cellular respiration is the release of energy from the breakdown of food in the presence of oxygen (occurs in the?????) At the organism level, respiration is the process of gas exchange—the release of carbon dioxide and the uptake of oxygen that occurs between RBCs and alveoli Breathing is the actual mechanical intake of air Copyright Pearson Prentice Hall
  • 4. BreathingBREATHINGLungs are sealedin pleuralmembranesinside the chestcavity.At the bottom ofthe cavity is alarge, flat muscleknown as thediaphragm. Copyright Pearson Prentice Hall
  • 5. BreathingDuring inhalation, thediaphragm contracts andthe rib cage rises up.This expands the volume ofthe chest cavity.The chest cavity is sealed,so this creates a partialvacuum inside the cavity.Atmospheric pressure fillsthe lungs as air rushes intothe breathing passages. Copyright Pearson Prentice Hall
  • 6. BreathingOften exhaling is a Air Exhaledpassive event.When the rib cage Rib cage lowerslowers and thediaphragm relaxes,pressure in the chestcavity is greater thanatmosphericpressure.Air is pushed out of Exhalationthe lungs. Copyright Pearson Prentice Hall
  • 7. Copyright Pearson Prentice Hall
  • 8. How Breathing Is ControlledHow Breathing Is Controlled Breathing is controlled by the medulla oblongata. The medulla oblongata monitors carbon dioxide in the blood. As carbon dioxide increases, nerve impulses make the diaphragm contract, bringing air into the lungs. The higher the carbon dioxide level, the stronger the impulses. Copyright Pearson Prentice Hall
  • 9. So what’s a hiccup?Longest bout of hiccups – 68 years!!!Check out IPp 50 for more info! Copyright Pearson Prentice Hall
  • 10. Lung Capacity Lab!! (we’ll do next class)ObjectiveMeasure the amount of air your lungs can hold Copyright Pearson Prentice Hall
  • 11. The Human Respiratory SystemRESPIRATIONAlveoli are grouped inclusters. Pulmonary arteryA network ofcapillaries surroundseach alveolus. Pulmonary vein Capillaries Copyright Pearson Prentice Hall
  • 12. Gas ExchangeRESPIRATION O2 Gas exchange takes place in the alveoli. Oxygen diffuses into the CO2 blood. Carbon dioxide in the blood diffuses into the alveolus. Let’s examine this up close Capillary Copyright Pearson Prentice Hall