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Science Chapter 4

Physical Science Vocab

Definition Vocab Word
Adenosine triphosphate; a molecule in all living cells that acts as fuel ATP
A chemical signal used to control body function Hormone
An instrument used to magnify things Microscope
A theory that all living things are made of cells, that cells are the basic units of structure and function in living things, and that cells only come form already present cells Cell Theory
The ability of organisms to maintain their internal conditions Homeostasis
To move molecules from one side of the membrane to the other Transport
A measurement of the amount of dissolved substance in a fixed amount of solvent Concentration
The movement of molecules from an area of high concentration to an area of low concentration Diffusion
A membrane that allows some molecules to pass but blocks other molecules from coming through Selectively Permeable Membrane
A difference in the concentration of a substance across a distance Concentration gradient
The movement of water through a cell membrane Osmosis
A solution whose solute concentration is lower than the solute concentration of another solution Hypotonic
A dissolved substance Solute
A solution whose solute concentration is higher than the solute concentration of another solution Hypertonic
A solution whose solute concentration is equal to the solute concentration of another solution Isotonic
A state where concentrations are equal in all parts of an area Equilibrium
A cell with only one outside membrane and no nucleus or other internal structures Prokaryote
Reproduction in which a bacterial cell divides into two cells that look the same as the original cell Binary Fission
A cell with several internal structures including a nucleus that are surrounded by membrances Eukaryote
A tiny membrane-bound structure inside a cell Orangelle
A group of cells that are similar and work together Tissue
A group of different tissues that work together to perform specific functions Organ
A group of organs that work together to perform specific connected tasks Organ System
Skin cells Epithelial Cells
Nerves made from collections of nerve cells Nervous System
A collection of organs, including the heart, which moves blood and gases throughout the body Circulatory System
Created by: imcnall
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