BIOL 1121 Lecture 35: 11. Respiratory Cycle
15 Mar 2017
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Karina da rosa: respiratory cycle, complications i. Pneumothorax: presence of air in the pleural cavity, thoracic wall is punctured b. Atelectasis ii: collapse of part of all of linch, can also arise from an obstruction of the airway, resistance to airflow i. ii. Factors that influence resistance: diameter of the bronchioles, bronchodilation i. ii. Increase in diameter of the bronchus or bronchiole. Epinephrine and sympathetic stimulation are responsible for this increase: bronchoconstriction i. ii. Decrease in diameter of the bronchus or bronchiole. Decreases surface tension so there is less of a collapsing force: alveolar gas exchange i. Composition of air: 80% nitrogen and 20% oxygen, dalton"s law, small levels of water vapor, co 2 and minor gases a. Inhaled air is a mixture of the contributions of each gas ii. Individual contribution of each gas: symbolized by p following gas formula. Nitrogen is pn 2: proportional to its concentration i. iii.
