Movement In and Out of Cells

Movement In and Out of Cells

YouTube Video

https://www.youtube.com/watch?v=Ptmlvtei8hw

Cell Membrane

For materials to get in and out of cells they need to pass through the cell membrane. Phospholipid bilayer sums up the cell membrane. The analogy used to describe the structure of the cell membrane is called a fluid mosaic. Phospholipids are made out of a phosphate head (hydrophillic) and a phosphate tail (hydrophobic)

Transport

When conditions are right smaller particles can easily pass through the membraine. Larger particles however need help from protein channels. When particles go through the membrane it is called a cell transport

Vocabulary

• Solute: particles (chocolate powder)

• Solvent: liquid that the solute dissolves in (hot milk)

• Solution: solute + solvent (hot chocolate)

• Concentration: amount/percentage of particles is the solution, represented by [C] (how chocolately is the hot chocolate)

Types of Transports

• Simple Diffusion: Particles travel from high to low [C]. This if for the smaller particles that can easily fit between the phospholipids

• Facilitated Diffusion: Particles travel from high to low [C]. This diffusion is for the particles that go through protein pumps

• Active Transport: The particles travel from low to high [C]. This type of transport requires energy.

• Passive Transport: Equilibrium is the goal of this transport. Diffusion is a type of this transport