Topic 2: Cell Physiology 1 - Membrane Transport (Passive) Flashcards
1
Q
What is membrane transport?
A
- movement of material between the intra and extracellular fluids
2
Q
What is a solute?
A
- substance dissolved in a solution
3
Q
What is a solvent?
A
- Substance the solute is dissolved in
ex. water
4
Q
What is passive transport? (3)
A
- no energy required (no ATP)
- movement from a high to low CG (down CG)
- the greater the difference in concentration the more molecules want to move
5
Q
What are 5 types of passive transport?
A
- Simple diffusion
- Facilitated diffusion
- Facilitated transport
- Osmosis
- Bulk Flow
6
Q
What is simple diffusion? (2)
A
- solute movement
- solute diffuses directly through cell membrane bilayer
7
Q
Which molecules use simple diffusion?
A
- small and lipid soluble molecules (O2, CO2, etc.)
8
Q
What is facilitated diffusion? (2)
A
- solute movement
- ions diffuse through membrane via protein channels
9
Q
What is facilitated transport? (3)
A
- solute movement
- diffuse across membrane using a specific carrier protein
- must bind to protein to be transported
10
Q
Which solutes use facilitated transport? (3)
A
- large
- charged
- water soluble molecules
11
Q
What is an example of facilitated transport?
A
- glucose into liver or skeletal muscle
12
Q
What is osmosis? (2)
A
- solvent movement
- movement of water across a semipermeable membrane (permeable to H2O) due to water concentration difference
13
Q
What occurs in osmosis?
A
water moves down its concentration gradient via pores (channels) or across membrane layer
14
Q
In osmosis, what is a dilute solution?
A
high water concentration and low [solute]
15
Q
In osmosis, what is a concentrated solution?
A
- low [H2O] and high [solute]
