1. By: Chastday Garza

2. What the Respiratory system does  It's purpose is to bring oxygen into your body  It helps your body get rid of that carbon dioxide.  The passageways purify, humidify, and warm incoming air

3. What it consist of  Ventilation - the exchange of respiratory gases (O 2 and CO 2 ) between the atmosphere and the lungs  External respiration - the exchange of gases between the lungs and the blood  Internal respiration - the exchange of gases between the blood and the systemic tissues  Cellular respiration - the includes the metabolic pathways

4. What are the main parts?  The respiratory system includes the nose, pharynx, trachea, bronchi and there smaller branches in the lungs  The lungs contain the aveoli, or terminal air sacs

5. The Nose  Nose- Only externally visible part of the respiratory system  Sticky mucus produced by the mucosa’s gland traps incoming bacteria and other foreign debris  Surrounded by a ring of paranasal sinuses located in the frontal, sphenoid, ethoid and maxillary bones

6. The Pharynx (throat)  Pharynx- a muscular passageway about 13 cm (5 in) long that vaguely resembles a short length of red garden hose  Connected to the nose

7. (continuation)  Air enters the nasopharnx, form the nasal captivity and descends through the oropharynx and laryngophary to enter the larynx below  Includes tonsils and adenoid

8. The Larynx  Larynx- voice box, routes air and food into proper channels and plays a role in speech  Has a spoon-shaped flap of elastic cartilage, the epiglottis  Also has a shield-shaped Thyroid cartage which produces interiorly and is commonly called “Adams apple”

9. (continuation)  When swallow larynx is pulled upward and the epiglottis tips, forming a lid over the opening

10. The Trachea  Windpipe from the larynx travels down the length to the level of the fifth thoracic vertebra, in the mid chest  Cilia continuously and in the direction opposite to the incoming air  It is rigid because its walls are reinforced with c-shaped rings of hyaline cartilage

11. (Continuation)  The rings purpose are to open parts of the rings about the esophagus and allow it to expand when we swallow large pieces or foods

12. The Primary Bronchi  Primary Bronchi- formed by the division of the trachea  The right primary bronchus is wider, shorter, and straighter than the left  By the time air is reached it is was cleaned, and well humidified  The smaller one is direct routes to the air sacs

13. The Lungs  Lungs- large organs  Mediastium which houses the heart, the great blood vessles, bronchi, esophagus, and other organs  Left lung has two lobes and the right has three  Walls of the alveoli are composed largely of single, thin layer of squamous epithelial cells