3.3 transport notes

3.3 transport notes - -1 TRANSPORT The cell membrane allows...

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- 1 - TRANSPORT The cell membrane allows only certain materials to pass through. One of its functions is to control what moves in and out of the cell. It is referred to as being semi-permeable , selectively permeable or differentially permeable . (Permeable means it lets anything in or out.) The ability of a substance to pass through the membrane depends on such things as size , charge , solubility , etc. The rate of movement across the membrane depends on such things as temperature , pressure , concentration , etc. In order for a cell to survive it must adjust to the changes in its environment. It must maintain homeostasis (meaning maintaining a steady internal environment despite changing external conditions). The cell maintains homeostasis by carrying out two types of transport. They are: 1. passive transport 2. active transport They differ based on the concentration gradient and energy requirement . Passive Transport
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3.3 transport notes - -1 TRANSPORT The cell membrane allows...

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