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Ch. 3: The Cellular Level of Organization
Cells and the constituent parts
38
Anatomy
Undergraduate 3
09/02/2011

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Term
3 Major Regions of a Cell
Definition
1. Plasma Membrane
2. Cytoplasm
3. Nucleus
Term
Nucleus
Definition
An organelle that contains most of the cell's DNA
Term
Chromosomes
Definition
A single molecule of DNA associated with several proteins.
Term
Nucleoli
Definition
A spherical body with a cell nucleus compose of protein, DNA and RNA. Site of small and large ribosomal units.
Term
Plasma Membrane
Definition
A flexible yet sturdy barrier that surrounds and contains the cytoplasm of a cell
Term
Phospholipids
Definition
Lipids containing phosphorous.
Term
Selective Permeability
Definition
Allowing some substances to pass more readily than others.
Term
Primary Active Transport
Definition
energy derived from the hydrolysis of ATP changes the shape of a carrier protein, which pumps a substance across a plasma membrane against the it's concentration gradient.
Term
Secondary Active Transport
Definition
The energy stored in Na+ and H+ concentration gradient is used to drive other substances across the membrane against their concentration gradient.
Term
Endocytosis
Definition
materials move INTO a cellin a vesicle formed from teh plasma membrane
Term
Pinocytosis
Definition
A form of Endocytosis where tiny droplets of extracellular fluid are taken up.
Term
Phagocytosis
Definition
The cell engulfs large particles.
Term
Receptor Mediated Endocytosis
Definition
Ligand-Receptor complexes trigger infolding of Clathrin coated pit that forms a vesicle containg ligands.
Term
Exocytosis
Definition
Movement of substances OUT of a cell. Secretory vesicles that fuse with the plasma membrane and release the contents into the extracellular fluid.
Term
Diffusion
Definition
A passive process in which the random mixing of particles in a solution occurs because of the particles kinetic energy.
Term
Simple Diffusion
Definition
A process in which substances move freely through the lipid bilayer of the plasma membrane.
Term
Osmosis
Definition
A type of diffusion where there is a net movement of a solvent through a selectively permeable membrane
Term
Facilitated diffusion
Definition
A type of diffusion where an integral membrane protein assists a specific substance across the membrane.
Term
Concentration Gradient
Definition
The difference in the concentration of one chemical from one place to another.
Term
Isotonic
Definition
Having equal tension or tone. A solution having the same concentration as cytosol.
Term
Hypertonic
Definition
HIGHER concentration of solutes than does the cytosol in RBCs.
Term
Hypotonic
Definition
A solution that has LOWER concentration of solutes than the cytosol of RBCs.
Term
Microvilli
Definition
Non-motile microscopic, fingerlike projections of the plasma membrane.
Term
Cytosol
Definition
Fluid portion of the cytoplasm that surrounds organelles.
Term
Organelles
Definition
Specialized structures within the cell that have characteristic shapes and perform specific functions in cellular growth, maintenance and reproduction.
Term
Ribosomes
Definition
The site of protein synthesis.
Term
Rough ER
Definition
Continuous with the nuclear membrane and usually folded into flattened sacs. Studded with Ribosomes.
Term
Smooth ER
Definition
Extends from Rough ER to form a network of membrane tubules. Contains enzymes.
Term
Golgi Apparatus
Definition
consisting of 3-20 cisternae. The first step in the transport pathway.
Term
Mitochondria
Definition
Powerhouses of the cell. Plays a central role in the production of ATP through aerobic respiration.
Term
Microtubules
Definition
largest of the cytoskeletal components. Large unbranched hollow tubes.
Term
Intermediate filaments
Definition
In between. Thicker than microfilaments but smaller than microtubules.
Term
Microfilaments
Definition
Thinnest elements of the cytoskeletal system.
Term
Nuclear Envelope
Definition
A double membrane that separates the nucleus from the cytoplasm.
Term
crenation
Definition
the contraction of a cell after exposure to a hypertonic solution.
Term
lysis
Definition
The breaking down of a cell.
Term
peroxisomes
Definition
similar to lysosomes. contain enzymes that us molecular Oxygen.
Term
Lysosomes
Definition
Membrane enclosed vesicles that form from the Golgi Complex.
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