Facilitated diffusion class 9 Biology in Urdu \ in Hindi | Lec #20 | chp #4 | cells and tissues - video Dailymotion

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00:00Assalamualaikum, today our topic of discussion is Facilitated Diffusion.

00:07In the previous lecture, we have studied about Simple Diffusion.

00:12Diffusion means to move molecules from higher concentration to lower concentration.

00:19So, there is a process of diffusion in our body.

00:24The outer covering of the cell is called cell membrane.

00:29It acts as a semi-permeable membrane.

00:33Some molecules enter the cell and some do not.

00:38Through this semi-permeable membrane,

00:43some molecules enter the substance cell and some come out of the cell.

00:50So, the small molecules like oxygen, carbon dioxide, water etc.

00:58easily enter the cell through the semi-permeable membrane and come out of the cell.

01:06While some large molecules do not easily pass through the semi-permeable membrane.

01:15For example, sugar, iron, glucose etc.

01:22These large molecules do not easily pass through the semi-permeable membrane.

01:30So, how do these molecules enter the cell?

01:37They enter the cell through facilitated diffusion.

01:43Facilitated diffusion means to move molecules from higher concentration to lower concentration through protein channels.

01:55So, there are protein channels in the cell membrane through which large molecules enter the cell and come out of the cell.

02:07This is called facilitated diffusion.

02:11Facilitated diffusion is also a type of passive transport because it does not use energy.

Facilitated diffusion class 9 Biology in Urdu \ in Hindi | Lec #20 | chp #4 | cells and tissues

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