BIO354H5 Lecture Notes - Lecture 14: Nostril, Gas Exchange, Passive Transport
Document Summary
Bio354 vertebrate form and function - lecture feb 29 2016. 2 cycles of respiratory activity in the frog. Under normal conditions (most commonly used): osscilatory cycle. Where the buccal cavity pressure would go above and below atmospheric pressure as the muscles contract and relax in the throat region. The glottis is kept closed the entire time. This method is used to exchange the gases in the frog lungs for fresh air. Critical features can be divided into 5 phases. During oscillatory cycle the lung pressure is way above atmospheric pressure. Large dip in pressure in the buccal cavity is the initial start characteristic of the ventilator cycle. Notice: lung pressure is much higher than atmospheric pressure during the oscillatory cycle. Throughout the oscillatory cycle, the lung pressure was much higher with the closed glottis. During the ventilatory cycle, there is a dramatic increase in pressure in the buccal cavity. Explanation of 5 phases of the ventilatory cycle:
