The Cell: Transport Mechanisms and Cell Permeability Flashcards


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created 12 years ago by mmartin26
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Exercise 4
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1

Molecular Motion

Random and erratic; reflects the kinetic energy of molecules

2

Velocity

Is lower in larger molecules and increases with higher temperatures

3

Passive Transport

Transportation and movement through the plasma membrane that is driven by concentration or pressure differences; includes diffusion, filtration, and osmosis

4

Active Transport

A form of facilitated diffusion that requires energy and carrier proteins that combine specifically with the transported substance; includes phagocytosis, pinocytosis, and receptor-mediated endocytosis

5

Diffusion

The spreading of particles in a gas or solution from high to low concentrations

6

Osmosis

The movement of water from low to high solute concentrations

7

Simple Diffusion

The unassisted diffusion of solutes through a selectively permeable membrane