The respiratory system by sujeet
- 1. The Respiratory System Copyright Pearson Prentice Hall
- 2. The Human Respiratory System 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. Breathing BREATHING Lungs are sealed in pleural membranes inside the chest cavity. At the bottom of the cavity is a large, flat muscle known as the diaphragm. Copyright Pearson Prentice Hall
- 5. Breathing During inhalation, the diaphragm contracts and the rib cage rises up. This expands the volume of the chest cavity. The chest cavity is sealed, so this creates a partial vacuum inside the cavity. Atmospheric pressure fills the lungs as air rushes into the breathing passages. Copyright Pearson Prentice Hall
- 6. Breathing Often exhaling is a Air Exhaled passive event. When the rib cage Rib cage lowers lowers and the diaphragm relaxes, pressure in the chest cavity is greater than atmospheric pressure. Air is pushed out of Exhalation the lungs. Copyright Pearson Prentice Hall
- 7. Copyright Pearson Prentice Hall
- 8. How Breathing Is Controlled How 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) Objective Measure the amount of air your lungs can hold Copyright Pearson Prentice Hall
- 11. The Human Respiratory System RESPIRATION Alveoli are grouped in clusters. Pulmonary artery A network of capillaries surrounds each alveolus. Pulmonary vein Capillaries Copyright Pearson Prentice Hall
- 12. Gas Exchange RESPIRATION 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