III7 - III. Physiology of Respiration Factors Influencing...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Physiology of Respiration III. Factors Influencing Pulmonary Ventilation A. Respiratory Passageway Resistance 1. upper respiratory passageways - relatively large, very little resistance to airflow (unless obstruction such as from food lodging or cancer) 2. lower respiratory passageways - from medium-sized bronchioles on down, can alter diameter based on autonomic stimulation a. parasympathetic - causes bronchioconstriction b. sympathetic - inhibits bronchioconstriction epinephrine - used to treat life-threatening bronchioconstriction such as during asthma and anaphylactic shock (carried by people susceptible to sudden constriction) B. 1. lung compliance - the ease with which lungs can be expanded by muscle contraction of thorax a. fibrosis - decreases compliance b. blocked bronchi - decreases compliance c. surface tension - alveoli difficult to expand d. thorax inflexibility - decreases compliance 2.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

III7 - III. Physiology of Respiration Factors Influencing...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online