BIOB32H3 Lecture Notes - Lecture 2: Chitin, Invagination, Hypercapnia
15 Apr 2019
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Many spiracles along the body, it gives rise to trachea and it divides into smaller component and carry air to tissues. Eg) flight mussels: inside: mitochondria uses ox in the air=> mitochondrion very close to the trachea that"s placed inside the same cells. Capillary never penetrates inside cells, but in insect trachea does and max ox delivery speed => closer tubes r, smaller ox distance for diffusion => easier. Pic: spiracles from diff insects under em, spiracles often have valves => can open/close spiracles and stop gas exchange/ventilation by closing => control over air in/out bc of valve presence. Video: spiracles from preying mantis: valve open/close controlling air in/out, abdomen also contracting to help ventilation. Ability to control air flow => controls diff kinda gas exchange to happen to what degree and for how long by opening/closing spiracles image: gas exchange pattern in insects at rest => patterns in resting insects.
