Ch 3.4-3.6 : Cell Membrane & Transport Flashcards
Movement of Solutes
- PM –> SP
- Two types of transport : PT & AT
Plasma membranes are selectively permeable or rather open to controlling the movement of the contents within the cell
It uses two forms of transport :
1. Passive transport
2. Active transport
Passive transport
- HC to LC
- No ATP
When the cell is able to naturally move substances from an area of high concentration to an area of low concentration,
- No energy (ATP) is needed for the transport to occur
Active transport
The cell requires energy (ATP) to move substances from an area of low concentration to an area of high concentration
Diffusion
- HC –> LC
- Balance
Is the movement of substances from a high concentration to a low concentration
- This results in a balance between both sides of the membrane
Factors that Can Affect Diffusion
- T, SD, MoS, CG
Temperature
Solvent density (e.g. water)
Mass of solutes (the substance)
Concentration gradient
Osmosis
- MoW –> Diff. P or SC
The movement of water that is caused by the differences in pressure or solvent concentration
Tonicity & Types
T = Amount of __ in a __
Solute is a ___ dissolved in another to form __
- I :same
- Hypo : H –> E C
- Hyper : Lo –> L C
Tonicity describes the amount of solute in a solution
- Solute : a substance dissolved in another to form a
solution
3 Types
1. Isotonic = there is the same concentration of water inside vs outside cell
2. Hypotonic= there is a higher concentration of water outside the cell → this makes the water enter the cell
3. Hypertonic= there is a lower concentration of water outside the cell → this makes the water leave the cell
Endocytosis
- Movement of __ into the cell by __
Is the movement of solutes into the cell by surrounding
them with a portion of the plasma membrane which creates a vacuole or a bubble
Exocytosis
- Release of C to __ of the cell
- Causes the ___ to fuse with the ______
Is the release of content to the outside of the cell which causes the vacuole to fuse with the plasma membrane
