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Purpose of the Digestive System

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Purpose of the Digestive System
BIOLOGY ‘S ASSIGNMENT

1/What is the purpose of digestion? * Break down food, absorb nutrient from food into body tissues and systems in body
2What is the name given to mammal only eat meat ? * Carnivores
3/What is the name of mammal only eat plant? * Herbivores
4/What is the difference between a fore-gut fermenter and hind-gut fermenter? Example?
Because plant cells have tough cellulose cell walls and herbivore are not able to digest, they use micro- organisms that live symbiotically to break down cellulose in fermentation process into nutrients | Fore- gut fermenter | Hind-gut fermenter | Location of caecum | Carry out digestion in a chamber- rumen, before the true stomach (abomasum). The ruminant stomach consists of four separate compartments divided by sphincters, rumen is one of them. | Carry out cellulose digestion in the caecum, a chamber after the small intestine | Role of micro-organism in digestion | Consume glucose from cellulose to produce fatty acids | Consume glucose from cellulose to produce fatty acids | Providing nutrient | Can be digested as a source of protein * Providing more nutrient | The host cannot digest micro-organism as a source of protein because food passes from stomach to intestine before bacteria acts on the food. | Special feature of animal | | Coprophagy(eating faeces) to gain nutrient efficiently | Advantages/disadvantages | Having more advantages in providing more nutrients.The toxic material is detoxified before going to the small intestine for absorption. | Disadvantages in providing more nutrients for the host. The toxic material can be absorbed into bloodstream before it is detoxified | Efficiency of caecum | Wasting less energy to digest cellulose | Wasting less energy to digest cellulose |

5/What is the purpose of a cow” sitting quietly and chewing” * When cows eat grass they try to eat as much as possible. So grass only is broken down into smaller pieces by chewing of teeth.

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