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17 Cards in this Set

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Diffusion
Net movement of particles from an area of higher concentration to an area of lower concentration.
Dynamic Equilibrium
continuous movement of particles with no overall change in concentration
Selective Permeability
Allows plasma membrane to let some materials to come into the cell whil keeping oter materials out.
Osmosis
Diffusion of water molecules from an area of higher water concentration to an area of lower water concentration
Isotonic Solution
concentration of dissolved substances in solution equals concentration of dissolved substances in the cell. (no osmosis and cells have normal shape)
Hypotonic Solution
Concentration of dissolved substances in solution is lower than the concentration of dissolved substances inside the cell. the water will move from solution into the cell and it will swell up and potentially explode
Hypertonic Solution
concentration of dissolved substances in solution is higher than the concentration of dissolved substances inside the cell. (water will move out of the cell and into the solution)
Active transport
cell actively moves things across the membrance. NOT osmosis or diffusion
Passive transport
cells transport, just happens, osmosis and diffusion happen, cell doesn't work to transport.
Osmosis and Diffusion
-Molecules move because they have conetict energy.
-Always in motion (many collisions)
Air pathway
In through nose or mouth, on to pharynx, past epiglottis, past the larynx, to the trachea, splits into 2 bronchus that each lead to a lung, bronchi branch into bronchioles, then branch and expand into alveoli.
epiglottis
prevents food from entering the lungs
Larynx
vocal chords are here
Trachea
passage way to lunds, lined with cilia and mucus to trap pollutants
Alveoli
thin walled sacs surrounded by blood vessels.
Allow for axygen and carbon dioxide exchange between lungs and bllod.
Increase surface area for gas exchange
Inhale
Rib muscles contract and lift ribs up and out
Diaphragm muscle contracts and moves down
Chest cavity volume becomes larger
air moves in
Exhale
Rib muscles relax and move in and down
Diaphragm relaxes and moves up
Chest cavity volumes decreases
Air forced out