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Digestive system

Digestive system processes

QuestionAnswer
Digestion The breakdown of food
Why digestion is necessary To make food soluble For the absorption of nutrients Easier to transport nutrients
2 types of heterotrophs Saprophytes Parasites
Saprophytes Feed off dead or decaying organisms / matter Important in nutrient recycling
Parasites Feed off a living organism ‘host’ Cause harm to the host Important in population control
Omnivore Eats both plants and animals e.g humans, blackbirds
Herbivore Only eats plants e.g rabbit, cow
Carnivore Only eats animals e.g fox, hawk
What is the Alimentary canal Digestive tract, starts at mouth and ends at the anus
Associated glands of the digestive system Salivary glands, pancreas, liver
Steps of the alimentary canal Ingestion Digestion Absorption Assimilation Egestion
Types of digestion Physical/mechsnical Chemical
Ingestion Taking food into the body by the mouth
Digestion process definition The breaking down of large pieces of food into smaller pieces that can be absorbed
Physical digestion Physically breaking down food. Occurs in the mouth teeth and stomach
Chemical digestion Involves enzymes breaking down food
Absorption Taking broken down food molecules from the alimentary canal into the blood or lymphatic systems.
Where does absorption occur? Mostly occurs in the small intestine
Function of Assimilation Using the materials absorbed. Used to repair damaged tissue and produce new tissue
Egestion The removal of undigested waste from the body
Peristalsis Rhythmical waves of smooth muscle contraction pushing food along the alimentary canal in one direction
Created by: EObrienHart
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