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Active and Passive Transport - Biology
Things to know when going into this subject:
- The Cell Membrane is a semi-permeable band that holds the cell together and lets only certain needed nutrients into, and out of the cell. In other words, it’s indecisive.
- That membrane is constantly letting things in and out
Passive Transport - requires no energy
- Simple diffusion
- Facilitated diffusion
- Movement from high concentration to low concentration
- Movement of water from a higher concentration to a lower consentration
- Use of protein molecules to help large molecules pass
Isotonic - has an equal concentration of solute.
Hyper-tonic - has a higher solute concentration than hypo-tonic
Hypo-tonic - has a lower concentration of solute than hyper-tonic
Lysed - to rupture/burst.
Active Transport - requires energy to transfer a molecule across the membrane
- Proton (Ion) Pump
- Endocytosis (Phagocytosis)
- Endocytosis (Pinocytosis)
- Na+ - K+ Pump
- Special carriers to move large molecules against concentration gradient
- 2 types - Phago and Pino
- Phago - solid
- Pino - liquid
- Bulk transport of material into the cell
- Moving large amount of material out of the way
ATP: Energy that helps transfer things in and out of the membrane, reproduction, and protein synthesis. It reacts with compounds in order to create this energy.