Control of breathing
Respiration is controlled by the medulla oblongata. This stimulates the following changes that change berating:
Chemoreceptors: inform Brain of excess levels of co2 and insufficient levels of oxygen at the working muscles, and cause increases in respiration.
Herring-bruer: stretch receptors in the lungs. Cause lungs to recoil to a safe size by stimulating expiration.
Irritants: cause coughing to keep airway clear.
Proprioceptors: located in muscles and joints. They detect movement.
Stressors: detect emotional and pain stimuli and can control respiration, voluntary for a short time.