Module 3: Cell Diffusion Flashcards
1
Q
What are the 3 main components of a cell?
A
– Plasma membrane
– Cytoplasm
– Nucleus
2
Q
Extracellular Materials
A
- Substances contributing to body mass that are
found outside the cells - E.G interstitial fluid
3
Q
Plasma Membrane:
A
- Lipid bilayer
surrounding body
cells - Separates
extracellular
materials from
intracellular ones - SELECTIVELY PERMEABLE/Dynamic/Flux/
4
Q
Passive Transport is when:
A
Energy is not required from the cell
5
Q
Active Transport is when:
A
- Cell provides metabolic
energy (usually ATP) to move substance
across
6
Q
Simple Diffusion:
A
Diffusion of fat-soluble molecules directly through the phospholipid bilayer
7
Q
Carrier-mediated facilitated diffusion
A
Diffusion via protein carrier specific for one chemical. Binding of substrate causes transport protein to change shape (open and close to allow it to move through)
- Lipid-insoluble solutes like sugar and amino acids
8
Q
Channel-mediated facilitated diffusion
A
- Small lipid-insoluble solutes
- Diffusion though a channel protein
- Mostly ions selected on basis of size and charge
- Just goes straight through channel protein if eligible
9
Q
Osmosis
A
- For water molecules only
- Diffusion of water through a specific channel protein (aquaporin) or just directly through the lipid bilayer itself
10
Q
Primary Active Transport:
A
- Requires direct use of ATP to transport
11
Q
Secondary Active Transport:
A
- Requires some sort of energy to transport BUT NOT ATP
