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Cells
All about cells.
| Term | Definition |
|---|---|
| Cell | a usually microscopic structure containing nuclear and cytoplasmic material enclosed by a semipermeable membrane and, in plants, a cell wall; the basic structural unit of all organisms. |
| Cell wall | the definite boundary or wall that is part of the outer structure of certain cells, as a plant cell. |
| Cell membrane | the semipermeable membrane enclosing the cytoplasm of a cell. |
| Organ | a grouping of tissues into a distinct structure, as a heart or kidney in animals or a leaf or stamen in plants, that performs a specialized task. |
| Organelle | a specialized part of a cell having some specific function; a cell organ. |
| Tissue | an aggregate of similar cells and cell products forming a definite kind of structural material with a specific function, in a multicellular organism. |
| Chloroplasts | a plastid containing chlorophyll. |
| Mitochondria | an organelle in the cytoplasm of cells that functions in energy production. |
| Nucleus | a specialized, usually spherical mass of protoplasm encased in a double membrane, and found in most living eukaryotic cells, directing their growth, metabolism, and reproduction, and functioning in the transmission of genic characters. |
| Vacuole | a membrane-bound cavity within a cell, often containing a watery liquid or secretion. |
| Ribosomes | a tiny, somewhat mitten-shaped organelle occurring in great numbers in the cell cytoplasm either freely, in small clusters. |
| Cytoplasm | the cell substance between the cell membrane and the nucleus, containing the cytosol, organelles, cytoskeleton, and various particles. |
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