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research with the use of microscopes

Cell Theory

idea that all living things are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells

Cell Membrane: structure

cell membrane: function

thin, flexible barrier around a cell; regulates what enters and leaves the cell

cell needs

water, oxygen, food, messages.

cell wastes

urea, vacuole, carbon dioxide, ammonia

cell concentration

active transport


process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated

factors that affect diffusion

exercise- makes diffusion go faster


diffusion of water through a selectively permeable membrane

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