Membranes, Transport and Homeostasis

Active Transport

Active Transport

Requires energy to move substances across the cell membrane

Carrier (Transport) Protein

Doors of the cell, helps molecules go back and forth through the cell

Concentration

The amount of a certain solute (substance)

Concentration Gradient

The difference in the amount of solute between two areas (High to Low)

Diffusion

The movement of molecules from an area of High to Low concentration

Extocytosis

The cell moving materials from the inside to the outside of the cell

Extracellular

Outside of the cell

Endocytosis

The cell moving materials from the outside to the inside of the cell

Facilitated diffusion

The movement of molecules from a High to Low concentration

Homeostasis

A state of balance among the organism

Intracellular

Inside the cell

Osmosis

Water molecules moving through the membrane from an area of Low to High concentration

Passive Transport

Does not require energy to move solutes across the cell

Fluid Mosaic Model

Describes the structure of the cell membrane

Plasma Membrane

The membrane found in all cells

Protein Pumps

A membrane protein that pumps ions in and out of the cell

Isotonic

Two solutions having equal concentration of solute

Hypertonic

A solution having a greater number of solutes outside a membrane

Hypotonic

A solution having a lower number of solutes outside the cell

Phospholipid

A group of polar lipids that make up the cell membrane

Hydrophilic

Water Loving

Hydrophobic

Water repelling