21 terms


-Quizzes online -Dr. Silverthorn -Exam 1
Which body fluid compartment contains high levels of K+, large anions, and proteins?
intracellular fluid
All of the following are types of mediated transport except one. Identify the exception.
a) facilitated diffusion
b) simple diffusion
c) secondary active transport
d) primary active transport
Simple diffusion
Bulk flow is fluid flow as a result of a __________ gradient.
Caveolae and clathrin-coated pits are both used in ______________.
Carrier proteins operating at their maximum rate are said to be __________.
Sodium ions are more concentrated in the extracellular fluid than in the intracellular fluid. This is an example of ___________.
chemical disequilibrium
Facilitated diffusion and active transport differ in that
ATP is necessary for active transport, but not for facilitated diffusion.
A primary active transport process is one in which __________.
molecules move through transport proteins that have been activated by ATP
Some transport proteins in the plasma membrane move a substrate against its concentration gradient but do not get energy by hydrolyzing ATP. This type of transport is known as _____.
indirect active transport
Osmosis, the primary mechanism by which water moves across the plasma membrane, is most like which of the following?
simple diffusion
The sodium-potassium pump uses ATP to move sodium and potassium ions across the plasma membrane. This statement describes _____.
primary active transport
A vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid. This statement describes _____.
Which of the following molecules can move across the phospholipid bilayer by simple diffusion?
a) amino acids
b) glucose
c) steroids
d) lipoproteins
e) all of the above
Which body fluid compartment has the smallest volume?
The membrane proteins that bind with specific molecules and change shape to transport them across the cell membrane are called __________.
The Na+-K+-ATPase pumps Na+ ions _________ the cell and K+ _________ the cell.
out of, in
The afferent and efferent axons together form the
peripheral nervous system.
Exocrine glands, smooth muscles, and cardiac muscles are controlled by the _______.
autonomic nervous system.
The multiple thin, branched structures on a neuron whose main function is to receive incoming signals are the
What does the Goldman-Hodgkin-Katz equation take into account that the Nernst equation does NOT?
the permeabilities of the ions
Ions are unequally distributed across the plasma membrane of all cells. This ion distribution creates an electrical potential difference across the membrane. What is the name given to this potential difference?