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17 Cards in this Set
- Front
- Back
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Characteristics of living organisms |
*Made of cells * Metabolism * Growth * Excretion * Responsiveness * Movement * Reproduction |
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Cells |
Basic structural and functional units of life |
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Levels of structural organisation (smallest to largest) |
1. Chemical 2. Cellular 3. Tissue 4. Organ 5. Organ system 6. Organism * Each level determines structure and activity of successive higher levels |
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Chemical Level |
* Smallest level * All living organisms made of chemicals * Properties of atoms and interactions = molecules which make up other levels |
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Cellular level |
* 2nd smallest level * Molecules form cells * Cells have common features but diff shape and sizes depending on function * Vital functions of life are conducted at this level eg metabolism |
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Tissue Level |
* 3rd level * 4 main types of tissues - epithelial, connective, muscle and nervous |
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Tissue |
Group of cells with a similiar structure that perform a specific function |
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Epithelial tissue |
Covers body surfaces, lines hollow organs/cavities, forms glands |
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Connective tissue |
Connects, supports and protects body organs |
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Muscle tissue |
Allows movement and generates heat |
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Nervous tissue |
Carries information from one part of the body to another |
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Organ |
Two or more tissues that work together to perform one of more functions |
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Organ level |
* 4th level * Organs occur throughout body, diff shapes, sizes and functions * Usually one tissue that acts as 'primary' (performs essential functions) and 'secondary' tissues which support. |
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Organ system |
Several organs that have similar or related functions working together as a unit/system |
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Organ System Level |
* 5th level * 11 major organ systems, with specific functions. -Integumentary - Cardiovascular - Skeletal - Lymphatic - Muscular - Respiratory - Nervous - Digestive - Endocrine - Urinary - Reproductive * Some organs make serve several systems |
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Organism |
Made up of all organ systems that work together to maintain life |
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Organism system |
* Final level * If one organ system fails, life is compromised. |
