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Biology regents 2

Characteristics of living things/homeostasis

Autotrophs they make their own food
Heterotrophs they eat other oranisms
Photosynthesis carried out by plants. It takes radiant energy from the sun and puts it into sugar molecules. Occurs mostly in the chloroplasts of plant cells
stomates small holes in leaves to exchange gasses
guard cells they open and close the stomates
respiration organisms get energy by breaking the bonds of sugar molecules. The released energy is ATP
aerobic respiration this requires oxygen and yields more ATP (energy)
anaerobic respiration no oxygen is required to yield the ATP
Active Transport moving molecules from a low concentration to a high concentration
osmosis the diffusion of water into or out of the cell
diffusion the movement of molecules from high concentrations to low concentrations
stimulus a change in the environment that you respond to
neuron a nerve cell
impulse the electrical signal carried by nerves
hormone a chemical signal (insulin, adrenaline, testosterone)
receptor molecules proteins on the surface of the cell membrane that receive signals from the nervous system
Created by: beth weir