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29 Cards in this Set

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  • Back
active transport
net movement of a substance across a membrane against a concentration or electrical gradient; requires release and use of cellular energy
centrioles
a minute body found near the nucleus of the cell. active in cell divison
chromatin
the structures in nucleus that carry the hereditary factors (genes)
cilia
tiny, hairlike projections on cell surfaces that move in wavelike manner
connective tissue
a primary tissue; form and function vary widely. functions include support, storage, and protection
cytokinesis
division of cytoplasm that occurs after the cell nucelus has divided
cytoplasm
the subsatnce of the cell other than that of the nucleus
cytoskeleton
an elebaorate netowkr of protein structures extending throughout the cytoplasm. acts as a cell's bones and muscles by furnishing an internal framework that determines cell shape, supports other organelles, and provides the machinery needed for intracellular transport and various types of cellular movements.
diffusion
the spreading of particles in a gas or solution with a movement toward uniform distribution of particles
endoplasmic reticulum
a membranous network of tubular or saclike channels in the cytoplasm of a cell
epithelial tissue
the tissue that covers the surface of the body and lines the body cavities, ducts, and vessels
filtration
the passage of a solvent and dissolved substance through a membrane or filter
golgi apparatus
a stack of flattened membranous sacs associated with swarms of tiny vesicles. Acts as a traffic director for cellular proteins
lysosomes
organelles that originate from the golgi appartus and contain strong digestive enzymes
matrix
produced by the connective tissue cells and then secreted to their exterior. It may be liquid, semisolid, gel-like, or very hard
microvilli
the tiny prkections of the free surface of some epithelial cells' increase surface area for absorption
mitochondria
the rod like cyoplasmic organelles responsible for ATP generation for cellular activities
mitosis
the division of the cell nucleus; often followed by division of the cytoplasm of a cell
muscle tissue
highly specialized tissue designed to contract or shorten to produce movement
nervous tissue
tissue composed of neurons, cells that conduct and receieve electrochemical impulses from one part of the body to another. Irritability and conductivity are the two major functional characteristics
nucleoli
small spherical bodies in the cell nucleus; function in ribosome synthesis
nucleus
a dense central body in most cells containig the genetic material of the cell
organelles
specialized structures in a cell that perform specific metabolic functions
passive transport
membrane transport processes that do not require cellular energy (ATP) for example, diffusion, which is driven instead by kinetic energy
phagocytosis
the ingestion of solid paricles by cells
pinocytosis
the engulfing of extracellular fluid by cells
ribosomes
cytoplasmic organelles at which proteins are synthesized
selective permeability
a barrier that allows some substances to pass throught it while excluding others
solute pump
protein carriers that use ATP to energize