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Absorption of Materials - Coggle Diagram
Absorption of Materials
Oxygen and nutrients from food must be absorbed into the bloodstream and delivered to cells for respiration
Cells in the body need oxygen to release energy from food efficiently by carrying out aerobic respiration
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The digestion system is based around a long tube called the alimentary canal, which stretches from mouth to anus
Waste materials, such as carbon dioxide, must be removed from cells into the bloodstream
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The surfaces involved in the absorption of materials have certain features in common (increase the efficiency of absorption):
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Air enters through the windpipe (trachea), which branches into two tubes called bronchi, which splits into smaller tubes called bronchioles, which then end up in microscopic alveoli (air sacs)
Many of the foods we eat are too large and insoluble to be absorbed into the blood. These foods must be digested to break them down into small soluble molecules that can be absorbed
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Food is digested in the mouth, stomach, small intestine and then absorbed into the blood through the lining of the small intestine
The structure of the small intestine is specialised for rapid absorption of small soluble food molecules
The lining of the small intestine is folded into millions of finger-like projections called villi, which provides a large surface area that increases the speed of absorption of small soluble food molecules
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