Chapter 3 - Cells Function

Cells

smallest living unit of the body

Plasma Membrane

Outer boundary

Cytoplasm

Between membrane and nucleus

Nucleus

Control center of cell

fluid mosaic model

plasma membrane model

fatty acid tail

repel water

phospholipid bilayer

makes selectively permeable

Phospholipids

creates membrane barrier

cholesterol

between phospholipids

protein

perform membrane functions

integral protein

allows ions/molecules to pass through

carriers

transport substance

receptors

recieve chemical signals

enzymes

catalyze reactions

peripheral proteins

structural support

membrane carbohydrates

made up of glycoproteins and glycolipids

membrane transport

passive and active transport

passive

no energy needed

active

need ATP

Simple diffusion

molecules move through phospholipid layer

Facilitated diffusion

some substances can’t pass through

channel proteins

create pores through membranes

carrier proteins

binds molecules to transport across membrane

osmosis

the diffusion of H2o across a selectively permeable membrane