The two examples that to prove that the size of cell depends upon the function of the cell are :-
I) the nerve cell is the longest cell in our body because the nerve cell help to transport the blood throughout the different organs in our body. While fat cell is the thickest cell in our body because the fat cell help in increase the fatilit in our body.

Relation between Cell Shape and Function
- **Example 1: Red Blood Cells**
Red blood cells, also known as erythrocytes, are small and biconcave disc-shaped cells. This unique shape increases the surface area of the cell, allowing for efficient oxygen and carbon dioxide exchange. The concave shape also enables the red blood cell to be flexible and squeeze through narrow blood vessels to deliver oxygen to tissues throughout the body. This shape is crucial for their function of transporting oxygen from the lungs to other parts of the body.
- **Example 2: Neurons**
Neurons, the specialized cells that transmit nerve impulses, have a unique shape that includes long extensions called axons and dendrites. The elongated shape of neurons allows for the rapid transmission of electrical signals over long distances. The dendrites receive signals from other neurons, while the axon transmits signals to other cells. This shape is essential for the function of neurons in sending and receiving information throughout the nervous system.
In both examples, the shape of the cells is directly related to the specific functions they perform. The structure of a cell is intricately linked to its function, highlighting the importance of cell shape in carrying out specific tasks efficiently.