Unit 3: Cell Membranes Flashcards
(18 cards)
Factors that affect fluidity
Temp
Cholesterol
Length of fatty acids
Degree of saturation
Diffusion
The tendency for particles of any kind to spread out evenly in an available space, moving from more concentrated regions to less
What type of proteins are involved with cell-cell recognition?
Glycoproteins
What are intergrins and what do they do?
It a membrane protein
Span the membrane and give it a stronger framework
How does diffusion happen in our lungs
It allows for oxygen to enter red blood cells and for co2 to leave them
What kind of cells need help from _____to move across the cell membrane?
Polar and charged ions need transport proteins
Tonicity
The ability of a solution to cause a cell to gain or lose water
What does tonicity depend on?
The concentration of solute that cannot cross the plasma membrane
What happens to an animal cell in an isotonic solution?
The cells volume remains consistent Bc water is entering and exiting the cell at the same rate
What happens to an animal cell in a hypotonic solution
The cell has the potential to burst as more water flows into it
What happens to an animal cell in a hypertonic solution
The cell can shrivel up and die without enough water flowing into it (crenation)
What happens to plant cells in an isotonic solution?
The cell becomes flaccid without enough water to put pressure on the cell wall
What happens to the plant cell in a hypotonic solution
The cell wall becomes turgid as water flows into the cell
What happens to a plant cell in a hypertonic solution
The cell wall shrivels and the cell does too as water leaves the cell, plasmolysis
What is facilitated diffusion and what does it not require
When a protein helps a cell move down its concentration gradient… It doesn’t require energy
1st law of thermodynamics
The total energy of an isolated system is constant
2nd law of thermodynamics
The total entropy of a system will always go up
Role of cholesterol in the cell membrane
Regulates fluidity
