Cells transport substances across their membranes choose two...

Cells transport substances across their membranes. Choose TWO of the following four types of cellular transport: 1. Osmosis 2. Active transport 3. Facilitated diffusion 4. Endocytosis/exocytosis For each of the two transport types you choose, describe the transport process and explain how the organization and properties of cell membranes function in the movement of specific molecules across the membrane by that transport process (10 points each; 20 points total). Give an example molecule that is transported by that form of transport (5 points each; 10 points total). Note if the transport process requires energy (5 points each; 10 points total).

Transcript

00:01 So osmosis and active transport both of these they play crucial roles in transport of substances across the cell membrane okay and this is how they help the cell to maintain the integral balance okay and also perform essential functions.

00:39 So first we'll discuss about osmosis.

00:43 So osmosis it is basically the passive movement of water okay so this passive movement of water it happens across a semi -permeable membrane.

01:07 Semi -permeable membrane means a membrane which is you know selective in its permeability it will not allow all substances to pass through.

01:15 The next thing is it happens from an area of high water concentration to low water concentration okay or in other words if the water concentration is high that means that the solute concentration is low okay and if the water concentration is low it means that the solute concentration is high okay.

01:55 So this process basically it occurs to equalize the concentration of solutes in both sides of the membrane.

02:03 So the main goal is to achieve equilibrium okay and osmosis it is driven by the tendency of water to flow from an area of higher water concentration to lower water concentration.

02:15 So this process it is very important to maintain the water balance in cells okay because if the water balance is not maintained then the cell will not be able to preserve its shape okay.

02:39 So the water balance in cells is important to maintain so that the cell can preserve its shape and also the turgor pressure okay.

02:57 Also in plant cells this osmosis it is responsible for water uptake and also to maintain rigidity okay...

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