Respiratory System 2 Flashcards
Pulmonary Ventilation
Respiration: Pulmonary Ventilation
air in/out of lungs
Alveolar Ventilation
Respiration: Pulmonary Ventilation
air in/out of alveoli
External Respiration
Respiration: Pulmonary Ventilation
Exchange of gasses b/w blood, lungs, and external environment
Gas Diffusion
Respiration: Pulmonary Ventilation
Occurs across blood air barrier b/w alveolar air and alveolar capillaries
Internal Respiration
Respiration: Pulmonary Ventilation
Occurs b/w blood and tissues
Hypoxia
Respiration: Pulmonary Ventilation
Low Tissue Oxygen levels
Anoxia
Respiration: Pulmonary Ventilation
No oxygen supply
Pressure
Physiology of Pulmonary Ventilation
Molecules in gas bounce around independently, more collisions = higher pressure
Boyle’s Law
Physiology of Pulmonary Ventilation
More collisions occur when molecules in smaller container
Atmospheric Pressure
Physiology of Pulmonary Ventilation
Pressure of air around us
Intrapulmonary Pressure
Physiology of Pulmonary Ventilation
Pressure inside respiratory tract
Start of breath
Physiology of Pulmonary Ventilation
Air pressure inside and outside the thorax equal, no air movement.
During Inhalation
Physiology of Pulmonary Ventilation
Lungs expand, pressure inside lungs decreases, air moves into lungs
During exhalation
Physiology of Pulmonary Ventilation
Thoracic cavity decreases in volume, pressure inside lungs increases above atmospheric and air is forced out to low pressure
Inhalation
Physiology of Pulmonary Ventilation
Intrapulmonary pressure < atmospheric pressure
Exhalation
Physiology of Pulmonary Ventilation
Intrapulmonary pressure > atmospheric pressure
Quiet breathing
Respiratory Muscles
normal breathing
Forced breathing
Respiratory Muscles
laboured breathing
Active inhalation via
Respiratory Muscles
via primary inspiratory muscles
Passive exhalation
Respiratory Muscles
via elastic recoil of tissues
Primary inspiratory muscles
Respiratory Muscles
used for quiet inhalation
Accessory inspiratory muscles
Respiratory Muscles
used for forced inhalation, inscrease speed/amount of rib movement
Names of primary inspiratory muscles
Respiratory Muscles
Diaphragm, external intercostals
Primary Expiratory muscles
Respiratory Muscles
There are no primary expiratory muscles. Passive process done by recoil
Accessory Expiratory Muscles
Respiratory Muscles
Abdominal muscles push diaphragm upwards
Surface Tension
Factors affecting Pulmonary Ventilation
Premature infants have decreased surfactant, leading to alveolar collapse