Cell Membrane Flashcards
What is the function of cell membrane
It provides protection for the cell
It does two things for the cell
- in with the good: brings in nutrients (oxygen, sugars, etc)
- out with the bad: removed waste(CO2, toxins, etc)
What’s the other term used for cell membrane
It’s also called the plasma membrane
Phospholipid
Lipid bilayer‘s form when hydrophobic tails lineup against each other
They act as a barrier to the passage of molecules in ions in and out of the cell
Transport proteins
They transport substances across the cell membrane such as ions
It moves through facilitated diffusion or active transport
Proteins involved in the movement of ions, small molecules, or macromolecules across the plasma membrane
The proteins me assist in the movement of substances by:
- fascinated diffusion(no energy needed)
- active transport(energy required)
Glycoproteins
They are the cell nametags
They allow cell recognition
Cells ability to recognize itself from one another
Helps with blood type, immune system, and rejection of foreign cells
They organize tissues and organs, rejection of foreign cells, including transplant organs
Cholesterol
Prevents cell membrane from being too hard or squishy
Contribute to membrane fluidity
Hinders the packing together of phospholipids
Membrane proteins
Peripheral protein that adhere only temporary to the biological membrane
2.
Integral proteins are proteins that are embedded and we’re stretched from one side of the membrane to the other
Integral proteins
Type 1
No function. They are just for structure
Type 2
Transport proteins
Type 3
Glycoprotein
The three types of transport
- Diffusion/osmosis
- Facilitated diffusion
- Active transport
Types of transport classification
Passive: not requiring energy
-these forms use concentration gradient/gravity to work and do not require energy
Active: requiring energy
-These forms go against concentration gradients or gravity and therefore require energy
Diffusion/osmosis
Diffusion: Is Win molecules move for one area of greater to lesser concentration. Particles spread out and even out concentrations. These particles could be anything, like food coloring dispersing in water, or tea particles diffusing through out of hot water
Osmosis: is the diffusion of water through the semipermeable cell membrane
Small molecules diffuse through small holes in the semipermeable membrane
Permeable Means for liquids or gases to flow through it
Facilitated diffusion
Pro Tien channels are integral proteins in the membrane allow particles like sugars and salts to diffuse throughout the membrane
Active transport
if molecules move from an area of lesser to greater concentration, energy is required
- necessary to remove large molecules (exocytosis)
- bring in large molecules (endocytosis)
- move molecules against the concentration gradient
• from lower concentration to higher concentration
Passive transport
Passive transport is a movement of ions and other atomic or molecular substances across cell membranes without need of energy input. Unlike active transport, it does not require an input of cellular energy because it is instead driven by the tendency of the system to grow in entropy.
