44 WJEC Biology AS Level - Marianne Izen - 2nd Edition Flashcards
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Organ: A group of tissues in a structural unit, working together and performing a specific function.
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An organ comprises several tissues working together, performing a specific function.
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In humans, for example, the eye contains nervous, connective, muscle and epithelial tissues and is the organ of sight.
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In plants, the leaf contains epidermal tissue, vascular tissue and packing or ‘ground’ tissue between the vascular bundles, and is specialised for photosynthesis.
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An organ system is a group of organs working together with a particular role.
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hierarchy of increasing complexity:
organelle > cell > tissue> organ> organ system > organism
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All the systems of the body work together, making an organism, which is a discrete individual.
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