t important factor affecting the rhythmicity center is CO2.
· ↑in arterial CO2 causes ↑ in acidity of cerebrospinal fluid (CSF).
· ↑ in CSF acidity is detected by pH sensors in medulla.
· medulla ↑ rate & depth of breathing.
Oxygen level does not regulate breathing unless arterial O2 falls dangerously low.
F. Respiratory System Disorders
· Asthma(천식) - muscles of bronchioles constrict, drastically reducing ventilation.
· Emphysema(폐기종) - destruction of alveoli.
· Tuberculosis(결핵) - highly contagious bacterial infection.
· Lung cancer - > 90% of lung cancer victims have a history of smoking.