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By Charlotte Cunningham | GCSE Biology

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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…

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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.
Oesophagus Transports food from the mouth to the stomach in a mechanical way by
muscular contractions called "Peristalsis"…

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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…

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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

Page 6

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The leaf (an organ) this is an excellent example of how all three tissues are structures

By Charlotte Cunningham | GCSE Biology

Page 7

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Protein Functions

By Charlotte Cunningham | GCSE Biology

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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…

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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

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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.
Enzymes are relatively cheap It costs a lot of money to maintain particular

By Charlotte Cunningham | GCSE Biology




Doesn't include B2.5??!

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