PHGY 210 Lecture Notes - Lecture 16: Energy Recovery, Myenteric Plexus, Preganglionic Nerve Fibers
25 Feb 2013
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Document Summary
The food enters the digestive system, which is then catabolically broken down into absorbable molecules are formed. Post-absorption, they are then processed for individual cells, mainly to provide energy and raw materials for growth and repair. The structure of the git differs between organisms. The general format of the earthworm s git is retained in higher organisms. Growth: the tube in humans is elongated, but became limited to a certain section of the body. A 1. 5 metre tall person, the digestive track is 4. 5m, however in a cadaver, the lack of contraction, the track becomes 9-10m. The surface area of the git is massively increased due to the grooved nature of the tube within. The average size of the git is 200-250 square metres. Differentiation: the simple tube is replaced with a complex system of connected organs, each of which is specialized for specific aspects of the process of absorbing the food intake.
