Respiratory system Flashcards
What are the 2 muscle groups used during inhalation?
Diaphragm and External inter costals
During inhalation, what is happening to the intrapulmonary pressure?
The gas spreads out
What happens to the lung volume during exhalation?
Decreases
What is happening to the diaphragm during inhalation?
It drops to create more room
What do the external intercostal muscles do during exhalation?
Relax
During exhalation, what is happening to the intrapulmonary pressure?
The air moves out of the lungs by diffusion
What 2 muscle groups are used during forced expiration
Intercostals, abdominal
What would happen to the lungs if the atmospheric pressure and the intrapulmonary pressure were to equalize?
The lungs would collapse
Define internal respiration
Exchange of gases between the blood and tissue cells
How is the majority of carbon dioxide transported in the blood?
Dissolved in plasma as a bicarbonate ion (HCO3-)
During internal respiration, where is the high carbon dioxide concentration?
Tissue cells
During external respiration, where is the high oxygen concentration?
Alveoli
How is the majority of oxygen transported in the blood?
Attached to hemoglobin on erythrocyte
What specific part of the lungs is involved in external respiration?
Alveoli
What gas is the respiratory stimulus (determines breathing rate)?
Carbon dioxide
