Embedded Files
Cell Membrane Structure
Cell Membrane Structure
Use the diagram below to fill the labels on the cell membrane. Booklet pg. 3
Cell Membrane Functions
Cell Membrane Functions
protects the cell by acting as a barrier
regulates the transport of substances in and out of the cell
receives chemical messengers from other cell
Primary Function: helps cells maintain HOMEOSTASIS
Primary Function: helps cells maintain HOMEOSTASIS
Cell Membrane Structure
Cell Membrane Structure
Fluid Mosaic Model
Fluid Mosaic Model
The orange structures are phospholipids that make up the cell membrane. Notice that the inside and outside of the cell are made of the same structures. This is called a phospholipid bilayer--two layers of phospholipids. The yellow layer in the middle is composed of the lipid steroid cholesterol. It gives structure to the cell membrane.
Fluid Mosaic Model
Fluid Mosaic Model
The Fluid Mosaic Model states that membranes are composed of a Phospholipid Bilayer with various protein molecules floating around within it. The 'Fluid' part represents how some parts of the membrane can move around freely, if they are not attached to other parts of the cell.
The cell membrane is made up of many different parts. The primary structures are the phospholipids, but there are also proteins and carbohydrates. The orange structures in the diagram are transport proteins which have a very SPECIFIC structure to allow only certain molecules to pass through it. We will discuss that movement of molecules later on. The carbohydrate chains (glycolipids and glycoproteins) are used as a cellular ID card. This is used when someone is needing an organ transplant--their tissues have to match the donor!
PHOSPHOLIPID
Type of lipid (fat)
Blue phosphate head is hydrophilic, which means that is likes to be surrounded by WATER.
Yellow fatty-acid tails are hydrophobic, which means they do not like to be around water.
Fats and oils are lipids too. Remember that oil will NEVER mix with water, because that is a property of lipids!
Cell Membrane Characteristics for Transport
Cell Membrane Characteristics for Transport
Due to the way the cell membrane is put together, some particles can move across the membrane, while others are unable to pass. The membrane is referred to as SELECTIVELY PERMEABLE OR SEMI-PERMEABLE!
Report abuse