Unit 2b: Using Energy

Homeostasis

Maintaining a stable internal environment

Buffers

Immediate means of regulating pH

Passive Transport

Moving molecules without using energy

Osmosis

Passive transport method involving the movement of water across a semi-permeable membrane

Diffusion

Passive transport method in which molecules spread out from areas of high to low concentration

Active Transport

Moving molecules using energy

Concentration Gradient

Difference in concentrations between two areas

Communication

Transfer of information

Pheromones

Chemicals used for communication in many organisms

Hormones

Chemicals used for communication between cells in many multicellular organisms