The Control and Mechanism of Breathing (Leaving Cert Biology): Flashcards
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What brain structure controls breathing?
What brain structure controls breathing?
Medulla oblongata
What does the medulla oblongata respond to?
What does the medulla oblongata respond to?
CO₂ levels in blood
Acid formed when CO₂ dissolves in blood plasma
Acid formed when CO₂ dissolves in blood plasma
Carbonic acid
Receptors that detect pH changes in blood
Receptors that detect pH changes in blood
Chemoreceptors
Definition of homeostasis
Definition of homeostasis
Maintenance of constant internal environment
Is inhalation active or passive?
Is inhalation active or passive?
Active process (requires energy)
Direction diaphragm moves during inhalation
Direction diaphragm moves during inhalation
Down
Direction ribs move during inhalation
Direction ribs move during inhalation
Up and out
What happens to thoracic pressure when lung volume increases?
What happens to thoracic pressure when lung volume increases?
Pressure decreases
Is exhalation normally active or passive?
Is exhalation normally active or passive?
Passive process (no energy required)
Direction diaphragm moves during exhalation
Direction diaphragm moves during exhalation
Up
Direction ribs move during exhalation
Direction ribs move during exhalation
Down and in
Why is air forced out during exhalation?
Why is air forced out during exhalation?
Thoracic pressure > atmospheric pressure
Effect of exercise on CO₂ production
Effect of exercise on CO₂ production
More CO₂ is produced