Respiratory System Your Lungs Function of the respiratory system: To exchange oxygen and carbon dioxide 2 Definitions of Respiration 1. (Cellular Level) 2. Process by The release of which oxygen energy from the and carbon breakdown of dioxide are exchanged molecules in between cells, food in the blood, and air in presence of the lungs oxygen Nose Theroute in which air enters the respiratory system Pharynx A passageway for both air and food Air moves from the pharynx into the trachea Larynx Voice box Contains highly elastic folds of tissue known as the vocal cords Trachea Windpipe Cartilage called the epiglottis covers the entrance to the trachea when you swallow Lined with cilia Bronchi 2 large passageways in the chest cavity Each leads to a lung Each divides into smaller bronchi until they reach tiny air sacs called the alveoli Alveoli Grape-like clusters Site where blood and air are side by side, site of gas exchange Delicate network of thin-walled capillaries surround the alveoli Lungs Human lungs are located in two cavities the two are not identical Both are separated into lobes with three lobes on the right and two on the left Gas Exchange in the Lungs Section 37-3 Alveoli Bronchiole Capillary Diaphragm Located at bottom of lung cavity Large flat muscle Creates partial vacuum in the chest cavity The Respiratory System Section 37-3 Pharynx Nose Larynx Trachea Mouth Lung Bronchiole Epiglottis Bronchus Alveoli Bronchioles Diaphragm Capillaries Edge of pleural membrane Figure 37-16 The Mechanics of Breathing Section 37-3 Air Air inhaled exhaled Rib cage Rib cage descends rises Diaphragm Diaphragm Inhalation Exhalation Emphysema Caused by cigarette smoking Loss of elasticity in the tissues of the lungs People with this disease have difficulty breathing Bronchitis Common in cigarette smokers and people who are around people who smoke Bacterial and viral Lung Cancer Uncontrolled mitosis Can be caused by cigarette smoking Cells of cancer can easily spread to other part of the body…… WHY? Flowchart Movement of Oxygen and Carbon Section 37-3 Dioxide In and Out of the Respiratory System Oxygen-rich Nasal air from cavities Pharynx Trachea Bronchi environment Oxygen and carbon dioxide Bronchi Bronchioles Alveoli Bronchioles exchange at alveoli Carbon Nasal dioxide-rich Trachea Pharynx air to the cavities environment You are NOT cool! Stop smoking!!!