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Multicellular organisms are made up of systems
Each system is adapted to exchange materials
When a Multicellular organism is in the early stages of development, cells differentiate to
specialised cells
Each specialised cells have specialised functions
The digestive system is a great example of a system which:
o Includes many different organs
o Each organ has a unique function
o Collectively helps and aids digestion
By Charlotte Cunningham | GCSE Biology…read more

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Digestive System
Organ Function
Salivary Gland Produce Saliva which helps to chemically start the process of digestion.
Teeth also aid the saliva by mechanically "churning" the good into
smaller, more digestible pieces.…read more

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A tissue is a group of cells which all have:
o Similar structures
o Similar Functions
There is a number of different types of tissues in plants and animals
In Animals
o Muscular tissues ­ contract to allow movement
o Glandular tissues ­ produces enzymes and hormones
o Epithelial tissues ­ cover some parts of the body
Organs are a collection of tissues
Sometimes several different tissues make up an organ
The stomach is an organ made up of the three example tissues above.…read more

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Plant contain tissues:
o Epidermal Tissue ­ cover the plant and its organ
o Mesophyll Tissue ­ carry's out photosynthesis
o Xylem and Phloem ­ Transport water and minerals
By Charlotte Cunningham | GCSE Biology…read more

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The leaf (an organ) this is an excellent example of how all three tissues are structures
together.…read more

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Protein Functions
By Charlotte Cunningham | GCSE Biology…read more

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Each enzyme is very specific and has a particular structure
Every enzyme has an active site
The active site is the part of the enzyme which binds to its particular substrate
Enzymes are produced by specialised cells in glands and tissues that line the gut
Enzymes are made inside the cells but move out into the gut where the enzymes come into
contact with food
When an enzyme remains on the outside of the cell, it is called an extracellular enzymes
Types of Food…read more

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Starch (made up of glucose) AMYLASE Glucose
Fat (Mar up of fatty acids LIPASE Fatty acid and glycerol
and glycerol)
Enzymes in detail
What is it? Where is it What it targets? Where it does The end product
produced? this?
Amylase Salivary Glands Starch (Glucose) Mouth Glucose
Pancreas Intestines
Small Intestine
Lipase Pancreas Fat (Fatty acids Small Intestine Fatty Acid
Small Intestine and glycerol) Glycerol
Protease Stomach Protein Stomach Amino Acid
Pancreas Small Intestine
Small Intestine
Digestive Juices
What is it? Where is it produced?…read more

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Advantages and Disadvantages
Advantages Disadvantages
Speed up the use of enzymes in industries Enzymes have to be kept in temperatures lower
than 45 degrees.…read more



Doesn't include B2.5??!

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