Unit 9 Respiratory System Pneumo Lung Pneumology Study

Unit 9: Respiratory System

• Pneumo: Lung • Pneumology: Study of the Respiratory System

• • • • 1. Nasal cavity 2. Pharynx 3. Larynx 4. Trachea 5. Bronchi 6. R. Bronchus 7. L. Bronchus 8. Bronchioles 9. Heart 10. R. Lung (3 lobes) 11. L. Lung (2 lobes 12. Fissure 13. Apex 14. Diaphragm 15. Pleura

Function: 1. Provides oxygen 2. Removes carbon dioxide Oxygen Carbon Dioxide

Respiratory System Structure and Function

1. Nose: – warms/ filters the air

2. Sinus: Warm/moisten air. Determines voice tone.

3. Pharynx: (Throat) Common passageway for food, air, and water. 5” long.

4. Epiglottis: Closes over the larynx when swallowing.

5. Larynx: Voice box (very sensitive)

6. Glottis: Vocal cords

7. Trachea: (Wind pipe). 4. 5” long. Rings of hyaline cartilage keep it open. Lined with a mucous membrane.

8. Bronchi: Branches of trachea. Similar to trachea.

9. Bronchioles: “Secondary Bronchi”. Thin walls of smooth muscle.

10. Alveoli: Air sacs: exchange Site of Oxygen/Carbon Dioxide gas

11. Pleura: serous membrane around the lungs to help keep moist

12. Diaphragm: thin skeletal muscle that sits at the base of the chest and separates the abdomen from the chest. It contracts and flattens when you inhale

Breathing Mechanism 1. contraction of the diaphragm and intercostal muscles expands the thoracic cavity causing lung volume to increase 2. The lungs increase in volume means the pressure is decreased = air rushes into the alveoli 3. Diaphragm and intercostal muscles relax and the thoracic cavity condenses to create a decrease in volume then pressure increases = air rushes out.

Breathing Mechanism