GCSE Biology - Levels of Organisation - Cells, Tissues, Organs and Organ Systems

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Organelles like the nucleus, ribosomes, and mitochondria have specific roles within a cell, contributing to the formation of specialized cells like epithelial and muscle cells, grouped into tissues and organs, which work together in organ systems like the digestive system.

Insights

  • Organelles are distinct structures within cells like the nucleus, ribosomes, and mitochondria, each playing specific roles, contributing to the specialization of cells like epithelial, muscle, and glandular cells.
  • Tissues are formed by similar cells cooperating for specific functions, creating structures like epithelial tissue covering surfaces or muscle tissue enabling movement, while organs are assemblies of diverse tissues executing particular tasks, exemplified by the stomach's role in combating microorganisms within the body.

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Recent questions

  • What are organelles?

    Organelles are subcellular structures with specific roles.

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Summary

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Cell Organelles and Tissue Functions Explained

  • Organelles are subcellular structures within a cell, such as the nucleus, ribosomes, and mitochondria, each with specific roles. Cells, which vary in shapes and sizes, contain different combinations of organelles, forming specialized cells like epithelial, muscle, and glandular cells.
  • Tissues consist of similar cells working together for a specific function, like epithelial tissue covering body surfaces or muscle tissue aiding in movement. Organs are groups of different tissues performing particular functions, such as the stomach killing microorganisms. Organ systems, like the digestive system, involve organs working together, with examples including the cardiovascular and reproductive systems.
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