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The lower the molecular weight...
the faster the rate of diffusion
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Molecular motion
- reflects the kinetic energy of molecules
- is random and erratic
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Velocity of molecular movement
- is lower in larger molecules
- increases with increasing temp
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The single characteristic of the differentially permeable membranes determines the substances that can pass through them?
DENSITY
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Hypertonic solution
the cells are said to be crenated
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Isotonic solution
full shaped cells
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Hypotonic solution
the cells are filled with h2o and can lyse - Hemolysis
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Active Transport
- uses ATP
- May occur against concentration and or electrical gradients
- explain solute pumping, phagocytosis, and pinocytosis
- move ions, amino acids, and some sugars across the plasma membrane
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Passive Transport
- no ATP
- include osmosis, simple diffusion, and filtration
- account for the movement of fats and respiratory gases through the plasma membrane
- use hydrostatic pressure or molecular energy as the driving force
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Movement of molecules from high to low concentration down a concentration gradient
DIFFUSION
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The diffusion of water
OSMOSIS
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Diffusion that occurs on its own
SIMPLE DIFFUSION
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Selection of what is allowed to pass through
FILTRATION
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Englufing of a molecule by a cell
PHAGOCYTOSIS
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Absorbtion of larger molecules via Edocytosis
FLUID-PHASE ENDOCYTOSIS
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Ability of the body to maintain a condition of equilibrium or stability within its internal environment
HOMEOSTASIS
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Goal of Homeostasis:
to stabalize health and functioning reguardless of the outside changing conditions
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Responsiveness
helps maintain homeostasis when environmental conditions change
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Sweating in a humid environment vs non-humid
high humidity -> sweat doesnt evaporate -> body temp increases -> sweat more
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