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Animal Physiology: Digestive system of a rat

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  • Essay length: 1405 words
  • Submitted: 26/08/2003
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AS and A Level Molecules & Cells

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Animal Physiology: Digestive system of a rat

Introduction

Plants and animals are composed of many different types of complex organic molecules. When eaten as food, these molecules are too large to be simply absorbed into an animal's body. For food to be absorbed, the molecules must be small enough to pass into the cells lining the gut. This is the purpose of digestion. Digestion is the process of breaking down organic food into molecules that are small enough to enter cells. Chemical digestion involves enzymes that break complex molecules into simpler molecules Mechanical digestion is the physical breakdown of food into smaller pieces, to increase the surface area available for enzyme action. Unlike chemical digestion, it does not chemically change the molecules. The mammalian digestive system consists of the mouth, oesophagus, stomach, small intestine, large intestine, rectum, anus and associated glands.

Aim

To locate, identify and describe the digestive tract of a placental mammal, and;

To compare and contrast the digestive system of different placental mammals and relate any differences in structure to function.

Apparatus

* Rat

* Dissecting board

* String

* Forceps

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