Question

Define tissues. 'Tissues exhibit division of labor'. Explain this statement with examples. [5 MARKS]

Answer 1

Tissue:

1. Tissue can be defined as a group of cells with similar shape and function.
2. They form a cellular organisational level, intermediate between the cells and organ system.
3. Organs are then created by combining the functional groups of tissues.

Tissue exhibit division of labour:

1. Division of labour is adaptation of different parts of an organism to carry out different functions.
2. The complex tissues which are made up of different types of cells show good division of labour.
3. The different cells in such tissues perform different functions and give the overall combined property to the tissue.

Example:

1. Blood is one type of complex fluid connective tissue of the animals.
2. In humans the blood has three types of cells- RBCs, WBCs and platelets.
3. RBCs function in transportation of oxygen and carbon dioxide to and from the cells of the body.
4. WBCs function in killing and eating away the foreign cells and things like bacterial cells coming from outside.
5. Platelets function in forming clots in wounds to prevent blood loss.
6. In this way, each constituent cell of the tissue blood performs different functions.