________ occurs when the driver ion and molecule move in opposite directions across the plasma membrane
Carrier-mediated facilitated diffusion
Channel-mediated facilitated diffusion
Primary Active Transport
Cotransport (symport)
countertransport (antiport)
Which of the following are considered unassisted membrane transport mechanisms?
simple diffusion
Secondary Active Transport
Which of the following molecules are able to permeate a cell membrane?
steroids
glucose
ions
methanol
complex amino acids
Crenation of a cell would be observed if it was placed in which of the following solutions?
Hypotonic
Hypertonic
isotonic
both hypotonic and hypertonic
both isotonic and hypotonic
Which of the following constitutes Fick's law of diffusion?
Lipid solubility of substance
Molecular weight of substance
distance a substance has to travel to cross the membrane
magnitude of the concentration gradient
surface area of the membrane
_____________ occurs when the response made by the effector amplifies the changes in the controlled variable cause by a stimulus
Negative feedback mechanism
positive feedback mechanism
Feed forward Mechanism
Allostasis
Positive feedback and feed forward mechanism
_______ is driven by the direct use of ATP to transport a molecule against its concentration
Simple diffusion
Shivering and sweating are examples of which of the following?
positive feedback
negative feedback
sensory mechanisms
effector mechanisms
set points
negative feedback and effector mechanisms
Movement of a substance into a cell against its concentration gradient is caused by _____
channel-mediated facilitated diffusion
osmosis
primary active transport
Eating a bag of salted potato chips without increasing sodium excretion would result in what sate
Positive sodium balance
Negative sodium balance
Stable sodium balance
negative glucose balance
It can't be determined
Which of the following are true of a cell (330m Osm internal environment ) placed in a 500mOsm salt solution?
The cell is hypertonic to the solution
The cell is hypotonic to the solution
The cell is isotonic to the solution
The solution exerts a higher osmotic potential than the cell
The cell exerts a higher osmotic potential than the solution
Which of the following is an example of positive feedback in the body?
blood clotting
return of blood pressure to normal after hemorrhage
increased respiration rate caused by accumulation of CO2 in the blood
decreased sympathetic nervous system activity that occurs in response to increased blood pressure
e)all of the above
secondary active transport
Homeostasis is the static constancy of the internal physiological environment
Active transport is the movement of a solute against its concentration gradient at the cost of energy
When two solutions are isotonic to each other there is non net movement of water
