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Chapter 2 A&P
Cells
31
Anatomy
Undergraduate 1
11/25/2012

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Term
Cells
Definition
Building Blocks of life
Term
Protoplasm
Definition
A viscous liquid matrix that supports all internal cellular structures and provides a medium for intercellular transport; also called cytoplasm.
Term
Organelles
Definition
The internal structures within the cells.
Term
Cell membrane
Definition
A structure that surrounds protoplasm, consisting of the fatty substances that seperate one cell from it's neighbor; also called plasma membrane.
Term
Extracellular
Definition
substance located outside the cell membrane.
Term
Intracellular
Definition
substances, such as organgelles, that are located inside the cell membrane.
Term
Protons
Definition
positively charged particles that are part of the make-up of an atom.
Term
Electrons
Definition
Negatively charged particles that are part of the make-up of an atom.
Term
Neutrons
Definition
uncharged particles that are part of the make-up of an atom.
Term
Lipid bilayer
Definition
The double layer of fatty components that create the outside of the cell membrane.
Term
Selective permeability
Definition
Allowing some but not all substances to pass through a membrane to maintain homeostasis.
Term
Homeostasis
Definition
The maintenence of a relatively stable internal physiologic environment.
Term
Electrolytes
Definition
Are chemicals that are dissolved in the blood and are made up of salt or acid substances that become ionic conductors when dissolved in a solvent such as water.
Term
Diffusion
Definition
Movement of particles or solutes from an area of high concentration to low concentration.
Term
solutes
Definition
particles,such as salts, that are dissovled in a solvent.
Term
Concentration gradiant
Definition
The difference in concentrations of a substance on either side of a selectively permeable memebrane.
Term
Osmosis
Definition

The movement of a solvent, such as water, from an area of low concentration through a selectively permable membrane to equalize contrations of a solute on both sides of the membrane.


 

Term
Osmotic pressure
Definition
The measure of the tendency of water to move by Osmosis across a membrane.
Term
Cranation
Definition
Shrinkage of a cell that results when toouch water leaves the cell through osmosis.
Term
Lysis
Definition
The process of disintegration or breakdown of cells that occures when excess water enters the cell through osmosis.
Term
Facilitated diffusion
Definition
process whereby a carrier molecule moves substances in or out of cells from areas of higher to lower concentration.
Term
Active transport
Definition
movement of a chemical by  the use of energy through a gradient, such as a cell membrane, in concentration or electrical potential, this movement is opposite the normal movement by diffusion.
Term
Filtration 
Definition
A process of the movement of water out of plasma across the capilary membrane into the interstitial space.
Term
Hydro static pressure
Definition
Blood pressure in the vessel walls created by the heart beating pushes the water out of the capillary into the interstitial space.
Term
Oncotic force 
Definition
Pulls water back into the capillary from the interstitial space in an effort to create balance.
Term
Endocytosis
Definition
The uptake of material through the cell membrane  by a memrane bound droplet or vesicle formed within the cells protoplasm.
Term
Phagocytosis
Definition
Endocytosis involving solid particles.
Term
Pinocytosis
Definition
Endocytosis involving liquid.
Term
Exocytosis
Definition
The release of secrecretions from cells that have been accumulated in vesicles.
Term

Isotonic 

 

Definition
A solution thahas the same osmatic pressure as the cells and the body fluids,(ie,a cell placed in the solution will neither shrink nor swell).
Term
Hypertonic
Definition
A solution with an osmotic pressure greater that that of the body fluid (ie, a cell placed in the solution wil shrink).
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