Difffusion

Difffusion

Functions of Membranes

• Protect cell

• Control incoming and outgoing substances

• 4.Selectively permeable - allows some molecules in, others are kept out

Multiple Choice

This is a balance that organisms maintain through self-regulating adjustments

• bilayer
• homeostasis
• secretions

Multiple Choice

What is embedded in the phospholipid bilayer?

• proteins
• salt
• water

Cell Membrane (Transport) 

• Cell Membrane and Cell Wall:

  • ALL cells have a cell membrane made of proteins and lipids 

• •Cell membranes and cell walls are porous allowing water, carbon dioxide, oxygen and nutrients to pass through easily

Function of the Cell Membrane:

• “Gatekeeper” of the cell—regulates the flow of materials into and out of cell—selectively permeable

• •Cell membrane helps cells maintain homeostasis—stable internal balance

Diffusion

• •Movement of molecules from an area of high concentration to an area of low concentration.

• •Movement from one side of a membrane to another, un-facilitated

Multiple Choice

Diffusion is the natural movement of molecules from:

• Areas of low concentration to areas of high concentration

• Areas of high concentration to areas of low concentration

• Cold to hot environments

• Gaseous to liquid environments

Multiple Choice

Movement of solute, NOT WATER, through the cell membrane from high to low concentration.

• diffusion

• active transport

• facilitated diffusion

• osmosis

Passive Transport:

 Diffusion

• Diffusion: random movement of particles from an area of high concentration to an area of low concentration

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