Passive movement across membranes 9.3 #1

Draw a diagram of the diffrent types of movement of materials across membranes

Explain passive transport

Movement across membranes that does not require energy.

* Is a spontaneous process where Materials move down a concentration gradient, from an area of high concentration to an area of low concentration

What is simple diffusion?

* Process where substances can travel through the membrane without using any proteins to facilitate movement.
* no energy required
* Moves along concentration gradient

Particals that move through simple diffusion

Uncharged particles like oxygen and carbon dioxide; and

Lipid soluble particles like alcohol and steroids

What is facilitated diffusion?

* Carrier and channel proteins (in the membrane) assist certain particles to diffuse into the cell through the membrane.
* No energy required
* Moves along the concertation gradient

What particles move through facilitated diffusion?

Charged particles like sodium and chloride ions; and

Larger molecules like glucose and amino acids

What is osmosis?

The movement of water through a semipermeable membrane from an area of high concentration to low concentration

Draw a diagram to explain osmosis

What is the diffrence between a solvent and a solute.

A solvent is a substance in which another can be dissolved in to create a solution, and is usually water. a solute is a substance that can be dissolved in another, and a solution is a mixture of both.