BISC 101 Lecture Notes - Lecture 15: Medulla Oblongata, Hemoglobin, Myoglobin
22 Apr 2017
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Concept d: gas exchange occurs across specialized respiratory surfaces (topic 10) ^air inhaled through the nostrils pharynx larynx trachea bronchi bronchioles alveoli=site of gas exchange. ^gas e(cid:454)(cid:272)ha(cid:374)ge are one cell layer thick and have very large surface area. ^a(cid:373)phi(cid:271)ia(cid:374)s (cid:271)(cid:455) positive pressure breathing, which pushes air down the trachea. ^mammals ventilate by negative pressure breathing, which pulls air into the lungs. ^the medulla oblongata regulates the rate and depth . ^the pons moderates basic breathing rhythm by smoothing out the transitions between inhalations and exhalations. ^sigmoidal shape of the (cid:272)urve co-operative binding of oxygen to hemoglobin. ^bohr shift to left means o2 binds strongly to hemoglobin. ^bohr shift to the right means o2 is released readily by hemoglobin.
