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786585
Tissues, Organs and Organ Systems
Description
GCSE Biology (Additional GCSE) Mind Map on Tissues, Organs and Organ Systems, created by seth.bragg on 04/24/2014.
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gcse biology
additional gcse
Mind Map by
seth.bragg
, updated more than 1 year ago
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seth.bragg
almost 11 years ago
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Resource summary
Tissues, Organs and Organ Systems
Organs in Animals
Tissues
Cells differentiate so that they can carry out different functions; differentiation is the process by which cells become specialised
A tissue is a group of similar cells that work together to carry put a particular function
There are three different types of tissue
Muscular; contracts to produce movement
Glandular tissue; produces substances such as enzymes and hormones
Epithelial tissue; covers some parts of the body
Organs
Organs are made up of tissues
An organ could contain several different types of tissue for example the stomach
Muscular tissues in the stomach churns the food and other contents of the stomach
Glandular tissues in the stomach produces digestive juices including acid and enzymes
Epithelial tissue in the stomach to cove the inner and outer surfaces of the stomach
Organ systems
Organ systems are groups of organs that carry out a particular function
In the body these include: the nervous system, the respiratory system, the reproductive system and the digestive system
The digestive system, for example, is made up of the following organs:
Pancreas and salivary glands; to produce digestive juices
Stomach; to digest food
Liver; to produce bile
Small intestine; to digest and absorb food
Large intestine; to absorb water from undigested food and produce faeces
Organs in plants
Tissues
There are three types of tissue in a plant
Epidermal tissue; covers the plant
Mesophyll; carries out photosynthesis
Xylem and Phloem; transport of substances around the plant (like veins)
Organs
Examples of organs in plants include:
Roots
Stems
Leaves
Leaves are adapted to absorb sunlight for photosynthesis in the following ways
Chlorophyll; to absorb sunlight
Large surface area; to absorb more light
Stomata; to let carbon dioxide diffuse into the leaf
Thin; short distance for carbon dioxide to diffuse into the leaves
Network of veins; To support the leaf and transport water and carbohydrates
The leaf
The internal structure of a leaf allows efficient photosynthesis
Thin, waxy cuticle; protects leaf without blocking out light
Thin, transparent epidermis; allows more light to reach the palisade cells
Layer of palisade cells at the top; to absorb light
Many chlorplasts in the palisade cells; increases absorption of light
Spongy mesophyll, air spaces in the leaf allow carbon dioxide to diffuse through the leaf and increase surface area
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