cell membrane structure and function Flashcards
what makes up the cells membrane structure
Bi lipids layer
what does an individual bi lipid consist of
They have a phospholipid head which is hydrophilic meaning they love water.
They have a phospholipid tail which is hydrophobic meaning they dislike water.
They both consist of fat and phosphate
what does selectively permable mean
This means the cells membrane allows which substances can pass through the Bi lipid layer
what are some things that can directly pass through the bi lipid layer
fat-solubles
what are the different proteins found in the bi lipid layer
- channel proteins
- receptive proteins
- recognition proteins
- carrier proteins
what does the channel protein do
will transfer small molecules in and out of the cells
i.e water
what does the receptive protein do
passes messages into the cell
i.e hormone cells
what does the recognition protein do
allows our cells to be recognized as a part of our body to remind the immune system
what does the carrier protein do
allows larger molecules to be transported into the cell
i.e glucose
what is the fluid mosaic model
refers to looking at the cell membrane and hydrophilic head from a birds-eye view angle
concentration gradients
a concentration gradient occurs when the concentration of particles is high in one area and lower in another
concentration gradient in passive transport
particles will diffuse down a concentration gradient from an area of high concentration to an area of low concentration.
this does not require energy
concentration gradient in active transport
particles will diffuse up a concentration gradient, from an area of low concentration to ana rea of high concentration.
this does require energy
what are the four main functions of the cell membrane
- the cell membrane separates the cell from neighbouring cells and protects the cell from the external environment.
- the cell membrane is selectively permeable meaning it determines what passes in and out the cell.
- the cell membrane provides internal support the cell membrane is joined with microfilaments which are a part of the cytoskeleton.
- the cell membrane is sensitive meaning it is the first part of the cell to be affected by any changes