Day 2 Agenda: Look over 6 weeks grades Conduct lung volume lab.

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Presentation transcript:

Day 2 Agenda: Look over 6 weeks grades Conduct lung volume lab

Respiration Unit Day 3 "Virtue herself is her own fairest reward." -Silius Italicus, PunicaSilius Italicus

Today’s Agenda Look over air flow sequence Notes on objective 5-9 Lung volume Lab

Boyles Law and Breathing Boyles Law: Pressure of a gas varies inversely with its volume. Inspiration lowers pressure in thorax, air flows inward. Expiration raises pressure, air moves out.

Objective 6: Muscles of Inspiration Inspiration occurs when the diaphragm and the intercostal muscles contract. Expiration occurs more passively as these muscles relax and the lungs recoil.

Obj. 7 Partial Vacuum The intrapleural space (space between lung and wall of chest) always has a more negative pressure than the interpulmonary space (inside lungs).

Obj. 7 Partial Vacuum The negative pressure must exist at all times to keep the lung in its proper shape and location to prevent lung collapse.

Obj. 8 Pulmonary Ventilation Friction in airways causes resistance and results in more strenuous breathing. Lung compliance depends on the elasticity of the lungs and chest flexibility.

Obj. 8 Pulmonary Ventilation Surface tension of alveolar fluid reduces alveoli size and could collapse alveoli.

Obj. 9 Lung Volumes Tidal volume – normal inhale/exhale amount Residual volume – air that remains in lungs after exhale.

Obj. 9 Lung Volumes Inspiratory volume – amount that can be forcefully inhaled Expiratory reserve – amount of forced exhale

Lung Volume Lab :