Tissues

Tissues 

1)      Permanent tissue – A well-differentiated plant tissue derived from meristematic tissue, which has lost its ability to divide.

2)      Differentiation – The process by which a cell attains a permanent shape, size and function.

3)      Simple permanent tissue – A permanent tissue composed of only one cell type.

4)      Complex permanent tissue – A permanent tissue composed of more than one type of cells which coordinate to perform a common function.

5)      Chlorenchyma - Parenchyma whose cells contain chloroplasts and hence performs photosynthesis.

6)      Aerenchyma - Parenchyma containing large air cavities, providing buoyancy to aquatic plants and allowing the circulation of gases.

7)      Xylem – The complex tissue that conducts water and minerals in vascular plants and composed of tracheids, vessels, fibers, and parenchyma.

8)      Phloem – The food-conducting tissue of vascular plants, consisting of sieve tubes, companion cells, fibers and parenchyma.

9)      Epidermis - The outermost, protective layer of cells covering the surface of a plant.

10)   Stratified epithelium - An epithelium composed of multiple layers of cells, with only the basal layer being in contact with the basement membrane.

11)   Ligament – A fibrous connective tissue that connects (or binds) bones to bones.

12)   Tendon – A fibrous connective tissue that connects bones to muscles.

13)   Voluntary muscles – Muscles which can be controlled according to our will.

14)   Involuntary muscles – Muscles which are not under the control of the will.

15)   Multinucleate cell – Cell containing more than one nucleus. 

16)      Uninucleate cell – Cell containing only one nucleus.

17) Neuron – A cell of the nervous system specialized to conduct nerve impulses and made up of cell body, axon and dendrites.

18)   Impulse – An electrical signal transmitted along a nerve fibre in response to a stimulus. 

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