THE HUMAN DIGESTIVE
SYSTEM
WHAT IS THE DIGESTIVE SYSTEM
WELL DIGESTIVE SYSTEM IS A GROUP OF ORGANS THAT WORK TOGETHER TO PERFORM A PARTICULAR FUNCTION THAT IS TO
BREAK DOWN THE FOOD WE EAT SO THAT IT CAN BE ABSORBED INTO THE BLOOD AND CAN BE DELIVERED TO ALL THE CELLS
Invertebrates do not need bones inside them to help them move - they have muscles instead!
Their shells or exoskeletons protect them from any harm that affects the outside of their body. However,
to move their body, they use lots of muscles to move or thrust forward.
PROCESS OF DIGESTION
THE PROCESS OF DIGESTION IS ALWAYS DONE IN A CHRONOLOGICAL ORDER THAT IS IN A SEQUENCE
OF PROCESSES :
INGESTION
DIGESTION
It means the taking of food and
drink into the mouth. We do this
using the lips, teeth and tongue
It is the break down of larger
food molecules into smaller food
molecules for the body to absorb.
ABSORPTION
ASSIMILATION
Its is the movement of small
nutrient molecules and mineral
ions through the walls of the
intestines and into the blood
It happens when the nutrients become a
part of the body. They are absorbed by
individual cells and used for energy or
to make new substances
EGESTION
It is the process of removal of
unwanted waste created by the
process of digestion and is
eventually passed out in the form
of faeces.
THE BELOW DIAGRAM HELPS YOU UNDERSTAND BETTER ABOUT THIS PROCESS