1 / 11

Respiratory Physiology

Respiratory Physiology. Respiratory System. - Supply the body with o 2 and dispose of co 2 Respiration: Pulmonary ventilation (~breathing) External respiration (gas exchange between blood & lungs)

kredinger
Télécharger la présentation

Respiratory Physiology

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Respiratory Physiology

  2. Respiratory System - Supply the body with o2 and dispose of co2 Respiration: • Pulmonary ventilation (~breathing) • External respiration (gas exchange between blood & lungs) • Transport of respiratory gases (transport of gases between the lungs and tissues cells, accomplished by the cardiovascular system, using blood as the transport vehicle) • Internal respiration (gas exchange between systemic blood & tissue cells)

  3. Lung Volumes & Capacities • Spirometry • Spirogram: record of volume change vs. time (inspiration & expiration) • Spirometer

  4. Total Lung Capacities • Tidal Volume (TV): amount of air inhaled or exhaled with each breath under resting conditions ~500mL • Inspiratory Reserve Volume (IRV): amount of air that can be forcefully inhaled at the end of a tidal inhalation M~3300mL vs. F~1900mL • Expiratory Reserve Volume (ERV): amount of air that can be maximally exhaled at the end of a tidal exhalation M~1000mL vs. F~700mL • Residual Volume (RV): the volume of gas remaining in the lungs at the end of a maximal respiration M~1200mL (33% of VC) vs. F~1000mL (25% of VC)

  5. Figure 2

  6. Pulmonary Capacities • Inspiratory Capacity (IC): • IC = TV + IRV • Expiratory Capacity (EC): • EC = TV + ERV • Functional Residual Capacity (FRC): • FRC = ERV + RV • Vital Capacity (VC): • VC = TV + IRV + ERV • Total Lung Capacity • TLC = TV + IRV + ERV +RV

  7. Predicted VC • Male • VC = 0.052H – 0.022A – 3.60 • Female • VC = 0.041H – 0.018A – 2.69 VC= L H= cm A= years

  8. Factors • Age- PC decrease • Gender- F<M • Weight- increase with size • Physical condition- increase with activity

  9. Obstructive vs. Restrictive Lung Disease • Obstructive pulmonary disease: airflow into & out of the lungs is reduced • Ex. Asthma (brochial tubes), Emphysema (alveoli), COPD (lung) • Restrictive pulmonary disease: reduced lung volume (TLC, VC, or resting lung vol) • Ex. Intrinsic (lungs) vs. extrinsic (chest wall) lung diseases

  10. Experiment B • Forced VC (FVC): maximal amount of air that a person can forcibly exhale after a maximal inhalation • Forced EV (FEV): % of FVC that a person forcibly expels in intervals of 1, 2, & 3sec • FEV = (vol of air exhaled in 1 sec/ VC) X 100

  11. Experiment B: segment 2 MVV • DO THIS 1st!!!!! • Maximal Voluntary Ventilation (MVV): pulmonary function test that combines volume & flow rates to assess overall pulmonary ventilation. • Hyperventilate for 15sec • MVV = (avg vol/cycle) X (number of cycles/min)

More Related