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15 Cards in this Set

  • Front
  • Back

What do cells need to maintain?

Constant temp., oxygen, pH levels, water concentrations, etc.

Homeostasis

Maintaining balanced internal enviroment

Cell membrane

Semi permeable layer of cell which surrounds the cell and regulates the movement of material into and out of the cell


Also called plasma membrane and phospholipid layer

Semi permeable

Only certain materials can flow through

Proteins

Act as a channel or passageway for large materials to move into and out of the cell

Phospholipids

Make up a semipermeable bi layer around the cell


Hydrophilic head- attracts water


Hydrophobic tail- repels water

Concentration Gradient

Material will always flow for an area of high concentration to low concentration

Equillibrium

The point at which materials are balanced on each side off the gradient

Cell Transport

Moving materials into and out the cell through the cell membrane

Passive transport


Movement of material in/out of the cell which flow with or down the concentration gradient


Does not require energy (ATP)

Diffusion

Passive transport


The process by which molecules spreads out from an area of high concentration to low concentration



Facilitated Diffusion
Passive transport

Movement of materials using a transport protein in the cell membrane

Osomsis

Passive transport

The diffusion of water across a semi permeable membrane from an area of high concentration to an area of low concentration

Active transport

Movement of materials in/out of the cell which flow against or up the concentration gradient


Does not require energy

Pumps

Active transport


Use a protein and energy(ATP) to push materials into or out of the cell