CELL
All the living things are composed of cells. A single cell is the smallest unit that has all the characteristics of life. Cell is defined as the structural and functional unit of the living body. General Characteristics of Cell Each cell in the body:
- Needs nutrition and oxygen
- Produces its own energy necessary for its growth, repair and other activities
- Eliminates carbon dioxide and other metabolic wastes
- Maintains the medium, i.e. the environment for its survival Cell
- Shows immediate response to the entry of invaders like bacteria or toxic substances into the body
- Reproduces by division. There are some exceptions like neuron, which do not reproduce.
TISSUE
Tissue is defined as the group of cells having similar function. There are many types of tissues in the body. All the tissues are classified into four major types which are called the primary tissues. The primary tissues include:
- Muscle tissue (skeletal muscle, smooth muscle and cardiac muscle)
- Nervous tissue (neurons and supporting cells)
- Epithelial tissue (squamous, columnar and cuboidal epithelial cells)
- Connective tissue (connective tissue proper, cartilage, bone and blood).
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