Page 9 - 02 Cells Biology Notes
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ORGANISM
Various organ systems together make up an organism.
An human organism has:
• Respiratory system
• Digestive system
• Circulatory system
• Nervous system
• Endocrine system
Levels of
organisations
Key definitions
• Organells: a structure within a cell (e.g. nucleus, vacuole, cytoplasm
and chloroplast are all organelles of a plant cell).
• Tissue: a group of cells with similar structures, working together to
perform a shared function.
• Organ: a structure made up of a group of tissues, working together to
perform specific functions.
• Organ system: a group of organs with related functions, working
together to perform body functions.
