Question

The average size of human body cells is
A. 5-10 µm
B. 10-15 µm
C. 20-30 µm
D. 70-80 µm

Answer 1

Hint: All the living organisms look very different from each other, but internally they all are made up of the same basic component, be it an amoeba or an elephant. The cell is the basic unit, the building block found in all the living things.

Complete answer: The presence of the cell is one of the basic conditions required to be called living. Cells perform different functions starting from making the basic body structure to the metabolism of food.
Human beings are multicellular. In human beings, trillions of cells are present which perform different functions. There are more than 200 different kinds of cells present in the human body for different purposes. Thus these cells are called ‘specialized’. Cells present in humans mostly contain a prominent nucleus along with other cell organelles and are surrounded by a plasma membrane.
The shape and size of different types of cells vary greatly according to their location and function. For example, RBCs require to flow through small blood vessels, so are very small in size, and on the other hand, neurons perform the function of transfer of signals throughout our body, thus, are very long. Cells that store food material or fat are very large. Most of the animal cells are small and range between 1-100 micrometres. But the average size of human body cells is between 20-30 micrometres.
So, the correct answer is “Option C”.

Note: Each cell has a certain life span after which it dies. Thus the cells die and new cells are produced in their place to maintain their quantity. So, we can say that the number of cells in each human varies and depends upon their weight, height, age, and some other factors.