Thursday, September 23, 2021

Cellular Transport

Biology Index

Where are we going with this? The information on this page should increase understanding related to this standard:  Evaluate comparative models of various cell type…Evaluate eukaryotic and prokaryotic cells.

Article includes ideas, images, and content from Troy Smigielski (2021-09)

Cellular Transport
(Is this moving an iPhone from one place to another?)

Cellular transport actually has nothing to do with moving iPhones.

Cells need to take in nutrients form the environment. They also need to get rid of wastes. 

Living cells are constantly in the process of moving things from place to place. Things?  Substances… ions and molecules need to move from place to place within living cells.

But, they have a membrane that is designed to keep some stuff in and some stuff out. 
  • Cell membranes function to regulate what enters and exits the cell.
  • They are made up of a phospholipids arranged in a bilayer.
In order to move things in and out, cells, have a couple of mechanisms. Sometimes things just move through the phospholipid bilayer. 

BUT… most large, charged, or hydrophilic molecules are unable to cross the cell membrane. Water is special in that it is polar and hydrophilic AND it can cross.

So, how do larger, charged, and/or hydrophilic molecules enter or exit the cell?

Cellular transport is the movement of substances across cell membranes, either into or out of a cell.

Within the cell, substances are transported by the vesicles. However, to exit the cell requires something more. 

There are two types of transport systems:

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