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South Habersham Middle School 7th Grade Science Powertime Vocabulary Unit 2

Digestion The act or process in living organisms of breaking down ingested food material into easily absorbed and assimilated substances by the action of enzymes and other agents.
Respiration The sum total of the physical and chemical processes in an organism by which oxygen is conveyed to tissues and cells, and the oxidation products, carbon dioxide and water, are given off.
Reproduction The natural process among organisms by which new individuals are generated and the species perpetuated.
Circulation The continuous movement of blood through the heart and blood vessels, which is maintained chiefly by the action of the heart, and by which nutrients, oxygen, and internal secretions are carried to and wastes are carried from the body tissues.
Excretion To discharge (waste matter, such as urine, sweat, carbon dioxide, or feces) from the body through the kidneys, skin, lungs, bowels, etc.
Cell A usually microscopic structure containing nuclear and cytoplasmic material enclosed by a semipermeable membrane and, in plants a cell wall; the basic structural unit of all organisms.
Organelles A specialized part of a cell having some specific function; a cell organ.
Cell Membrane Also called: plasma membrane a very thin membrane, composed of lipids and protein, that surrounds the cytoplasm of a cell and controls the passage of substances into and out of the cell.
Nucleus a specialized, usually spherical mass of protoplasm encased in a double membrane, and found in most living eukaryotic cells, directing their growth, metabolism, and reproduction, and functioning in the transmission of genic characters.
Cytoplasm the cell substance between the cell membrane and the nucleus,containing the cytosol, organelles, cytoskeleton, and various particles.
Created by: hbogue