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-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.

pressure

Caveolae and clathrin-coated pits are both used in ______________.

endocytosis

Carrier proteins operating at their maximum rate are said to be __________.

saturated

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 _____.

exocytosis

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

steroids

Which body fluid compartment has the smallest volume?

Plasma`

The membrane proteins that bind with specific molecules and change shape to transport them across the cell membrane are called __________.

carriers

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

dendrites

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?

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