Chapter 3 Section 3 (Lecture) Flashcards
Plasma Membrane
Phospholipid bilayer, selectively permeable, separates cytosol and ECF.
What is selective permeability based on?
Characteristics of the substance and Features of the membrane.
What are the types of membrane transport?
Passive and Active.
Does passive transport require ATP?
NO
Does active transport require ATP?
Yes.
Name examples of passive transport.
Diffusion and osmosis.
Name examples of active transport.
Vesicular Transport.
Diffusion is what?
The movement of a substance across its concentration gradient from a higher to lower concentration.
Where does diffusion occur?
In the air and in solutions.
In ECF water and solutes diffuse how?
Freely.
Diffusion rates are affected by?
several factors.
Diffusion is directly related to?
Temperature and size of concentration gradient.
Diffusion is inversely related to?
Distance of diffusion and molecular size of diffusing substance.
Electrical attraction
accelerates diffusion.
Electrical repulsion
reduces rate of diffusion.