1. Respiratory System

2. Important Structures Nasal Passages- air filtered, warmed (capillaries), and moistened (globulet cells- secrete mucous) Larynx- voice box, vocal cords

3. Important Structures Trachea: tube made of rings of cartilage Aveoli: networks of capillaries, supplied by pulmonary artery and vein

4. LUNGS Located in an air tight compartment (thoracic cavity) Protected by 12 ribs Surrounded by pleurae

6. Sequence of Respiration Mouth– nasal passages--- pharynx---larynx---trachea--- bronchi---lungs (brochioles— alveoli)

7. Gas Exchange What gases? Location- Alveoli Why is alveoli the location of gas exchange?

8. Alveoli Thin walled Excellent capillary blood supply Large surface area Moist lining makes gases easily diffuse

9. Where do oxygen and carbon dioxide go? Oxygen- carried by hemoglobin CO 2 : dissolves in blood or some enter RBC

10. Breathing Movement of air in and out of lungs Players- diaphragm and intercostals muscles of the ribs

12. Breathing Inhale: contract Exhale: relax

13. Control of Breathing Voluntary: controlled by cortex Involuntary: a. Medulla oblongata (brain) b. sensors in blood stream monitor carbon dioxide levels

14. Diseases of Respiratory System Emphysema Bronchitis Smoking affects your body: –Constricts blood vessels- increasing blood pressure –Increases heart rate –Blocks transporting of oxygen