BIO 241 1st Edition Lecture 17 Outline of Last Lecture I. Oxygen transport 2II. Carbon dioxide transportIII. Control of respiration 1Outline of Current Lecture II. Control of respiration 2III. Hyperventilation and hypoventilationIV. Negative feedback controlV. Hypoxia and positive feedbackCurrent LectureII. The BASIC RESTING RESPIRATORY CYCLE is 1 breath/5 sec which is 12 breaths/min. Inspiratory neurons are active for 2 seconds. During this time, an output goes to the spinal cord,which goes to the phrenic nerve and intercostal nerves, which causes the diaphragm to contractand the thoracic diameter increases and the external intercostals contract so thoracic length increases. Therefore, lung volume increases, lung pressure decreases, and normal resting inspiration occurs. Expiratory neurons are inhibited for 3 seconds and then allows the diaphragm and external intercostals relax, thoracic volume decreases and the elastic recoil and surface tension effects occur. Therefore, lung volume decreases, lung pressure increases, and normal resting expiration occurs.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.III. Hyperventilation causes increased H+ used to reform carbonic acid is used to reform CO2, pHincreases, and increased CO2 lost from the body. During hypoventilation, as CO2 accumulates inthe body, H+ accumulate in the body, and pH decreases.IV. This is the process of negative feedback control.V. This is hypoxia and positive
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