Name: Human Cell
Uploaded: 2019-07-19
Duration: 5 min 29 s
Description: In this video, we will learn about the human cell, the structures present in the cell, and the functions of each structure. View this video now.

Question

You know that cells keep multiplying in our body. Then why does our body grow to a certain size? Why does it not keep on growing?

Accepted Answer

A cell is small when it is formed. But it gradually grows in size by receiving the nutrients from the food we eat. After a cell matures, it stops increasing in size and divides to form cells, called daughter cells. This process is called cell division. Cell division starts with the division of nuclear material. Once the nucleus divides, the cell membrane also divides, forming two new daughter cells. New cells are required for the growth of an organism and replace the old dead or damaged cells. Millions of cells die and are replaced every second in our body. It also maintains the total number of chromosomes in the cell. Some unicellular organisms like bacteria and Amoeba reproduce through cell division. Thus, the process of cell division is necessary for the growth, repair and replacement in the body.

The surface to volume ratio refers to the amount of surface area per unit volume of an object. The ratio between the surface and volume is calculated by dividing the surface area by the volume. The lower the ratio, the slower the transport of the molecules within the cell and with the surrounding environment. The surface area to the volume ratio gets smaller as the cell gets larger. Thus, if the cell starts to grow beyond a certain limit, not enough material will be able to cross the plasma membrane fast enough to accommodate the increased cellular volume.

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Subject Experts Science Solutions for Exercise - Subject Experts Solutions for Chapter: Cell-Structure and Functions, Exercise 4: HOTS

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