BIOA02H3 Study Guide - Midterm Guide: Hemoglobin, Mechanoreceptor, Carbonic Anhydrase
12 Mar 2015
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BIOA02H3 Full Course Notes
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The human/mammalian lung: breathing in (inspire) in response to the diaphragm (a major respiratory muscle) contracting. It contracts and moves downwards towards the abdomen; which causes the chest+lungs to expand: it basically sucks air into the lungs through the mouth/nostrils, the diaphragm is controlled by the phrenic nerve which signals during inspiration. 4: positional receptors in the joints and muscles that are activated during movement and. Irritant receptors in lungs that detect irritants and initiate coughing exercise inputs. Mechanism of oxygen-sensing in the carotid body: when blood o2 levels are reduced, a reduction is sensed by the oxygen-sensor of the plasma membrane of glumus cells. The sensor is activated, which causes closure of k+ channels; k+ ions build up, and since they are positively charged they cause the plasma membrane to depolarize; activating a voltage-gated ca2+ channel. The nerve fires an action potential which travels to.
