Cell Transport

The Plasma (aka “cell”) membrane is made up of a lipid (generally phospholipid) bilayer (two layers)

maintaining equilibrium in the internal environment Homeostasis maintaining equilibrium in the internal environment

Diffusion Net movement of particles / solute from an area of higher concentration to an area of lower concentration. Occurs because of the random movement of particles. Passive, slow process. Affected by: Temperature Concentration Pressure

solvent solute + = solution

Transport proteins provide larger openings in the plasma membrane through which particles can pass…

Passive, aided diffusion A form of passive transport using transport proteins Carrier Protein Passive, aided diffusion

Osmosis: movement (diffusion) of water / solvent from High to Low concentration VIDEO

Other Active Transport… Endocytosis- process of taking material into the cell by means of infolding the cell membrane to form a vacuole Exocytosis- the membrane of a vacuole fuses with the cell membrane and expels its contents out of the cell

Types of Solutions Hypertonic- concentration of solute outside of cell is greater than inside of cell, water flows out, cell shrivels Hypotonic- concentration of solute inside cell is greater than outside of cell, water flows in, cell swells Isotonic- concentration of solution is the same inside and outside of cell, water flows equally in and out, cell remains same size

A: Hypertonic

B: Hypotonic

C: Isotonic

Levels of organization Cells Specialization – cells throughout an organism developing in different ways to perform different tasks Blood cells  transport oxygen Muscle cells  have overdeveloped cytoskeleton Levels of organization Cell  tissue  organ  organ systems Tissue  groups of similar cells performing a similar function Organ  groups of tissues working together Organ systems  groups of organs working together

Show cellRAP (student created) PPT presentation