Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
16 Cards in this Set
- Front
- Back
|
Homeostasis
|
a DYNAMIC constancy of the internal physiological enviornment
|
|
|
Physiology
|
the study of the biological functions and processes of the human body under normal conditions
|
|
|
Negative Feedback Mechanism
|
Action taken by the effectors to OPPOSE changes in the controlled variable caused by a stimulus
|
|
|
Positive Feedback Mechanism
|
Response by effectors that amplifies changes in the controlled variable caused by a stimulus
|
|
|
What is the plasma membrane permeable to?
|
N2, CO2, O2, Ethanol, Steroids, Urea, and water
Hydrophobic nonpolar molecules and some very small uncharged polar molecules |
|
|
Simple Diffusion
|
High--> Low
Unassisted transport (transport without the assistance of a protein) |
|
|
Channel-mediated facilitated diffusion
|
specialized channel proteins created hydrophilic tunnela
Small polar molecules and ions High--->Low Highly selective Faster than carrier-mediated transport |
|
|
Carrier-mediated Facilitated diffusion
|
Transport of larger, hydrophilic (polar) molecules
Proteins undergo a conformational change High--->low |
|
|
Primary Active Transport
|
Moves AGAINST concentration gradient
low--->high direct use of ATP |
|
|
Secondary Active Transport
|
transport driven by the energy of another concentration gradient
"indirect use of ATP' |
|
|
Cotransport (symport)
|
driver ion and molecule move in the same direction
|
|
|
Countertransport (antiport)
|
driver ion and molecule move in opposite directions
|
|
|
Osmosis
|
simple diffusion of water
moves down its own concentration gradient |
|
|
Isotonic solution
|
both solutions have teh same concentration of solutes
no net movement of water |
|
|
Hypotonic solution
|
concetration of solute is lower than the solution it is being compared to
cell lyses cell 300mOSM solution cell is in 200mOSM |
|
|
Hypertonic solution
|
concentration of solute is higher than the solution it is being compared to
cell crenates cell 300mOSM solution cell is in 500mOSM |
