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CHCS 7th Ch 4A

CHCS Life Science Chapter 4 (p50-54)

cell membrane a thin covering that forms the outer boundary of a cell
selectively permeable an important characteristic of membranes; certain molecules are allowed to pass through the membrane, while others are not
passive transport the movement of substances through a membrane without the use of the cell's own energy; diffusion and osmosis are types of passive transport
2 types of passive transport diffusion and osmosis
diffusion the movement of molecules from an area of high concentration to an area of low concentration
osmosis the movement of water through a membrane from an area of high concentration to an area of low concentration
Anton von Leeuwnhoek invented the compound microcope; looked at pondwater; called the moving organisms he saw "wee-beasties" or "animalcules"
active transport requires the cell to use its own energy to move substances through a membrane
Created by: mrslisawatson