Movement across membranes
- Created by: Natasha Mirchandani
- Created on: 12-11-12 20:41
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- Movement across membranes
- move through passive transport
- down a concentration gradient
- do not require energy
- down a concentration gradient
- active transport
- up a concentration gradient
- energy is required for this
- mainly ATP
- energy is required for this
- up a concentration gradient
- down a concentration gradient
- do not require energy
- move materials across membranes
- several mechanisms for:
- bringing in materials
- delivering materials to other parts of the body
- removing waste products
- plays an important role in maintaining homeostasis
- some materials pass into+out of cells by crossing the cell membrane
- do this without using energy
- passive transport
- movement of materials across a membrane that doesn't require energy from the cell
- endocytosis
- brings large molecules into the cell
- active transport
- wrap themselves around the material making a small sac
- pinches off of the membrane into the cell, then joins with other organelles
- exocytosis
- reverse process
- endocytosis
- Example: Diffusion
- during this, molecules will move from an area of higher concentration, to an area of lower concentration
- movement of materials across a membrane that doesn't require energy from the cell
- concentration gradient
- the region over which there is a change in concentration of substance
- molecules diffuse down a concentrated gradient
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