BIO 11 Lecture Notes - Lecture 11: Chronic Obstructive Pulmonary Disease, Exudate, Smog
3 Sep 2020
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Document Summary
Change in rate (function of duration of stimulation) Determined by the amount of time muscles are stimulated. Longer contractions or stimulation slower the breathing. Changes in depth (function of frequency of stimulation) More signals received the stronger the contraction (more motor units involved) Irritants in the air (dust, fumes, smog, pollen) are detected by receptors in the lungs. As you breathe into lungs, lungs stretch. Stretch receptors prevent lungs from stretching too far in order not to damage the tissue. Activation of stretch receptors in the lungs inhibits vrg. When we are in an emotional state, it can affect our breathing amygdala can influence hypothalamus to change rate of breathing. We can send signals from cortex and bypass medulla to affect somatic motor neurons can cause changes in muscular contractions. Co2 level: most important in changing our rate of breathing. Obstructive emphysema: destruction of alveoli decreasing surface area. Chronic bronchitis: excessive mucus production due to irritation.
