Exam 2: Cell Physiology

The ____________________ equation equates the equilibrium potential for an ion with the ion's concentration difference outside and inside the cell.

Which of the following does NOT require energy expenditure

At ____________________ potential, typically around -55 mV, rapid depolarization occurs.

Carrier molecules always require energy to accomplish transport of a substance across the membrane.

A given synapse may produce EPSPs at one time and IPSPs at another time.

The endoplasmic reticulum can be thought of as a cellular factory that produces which two compounds

Phosphorylation of a carrier can alter the affinity of its binding sites, accompanied by a change in its conformation.

Which of the following does diffusion result from

At resting potential, the outside of the cell is negative compared to the intracellular fluid.

Where is the nucleus of a neuron housed

Match the vesicles, labelled a. through c., with their characteristics. (Options may be used more than once or not at all.) -originate from the endoplasmic reticulum

____________________ is a positive ion that tends to leak out of cells passively.

Which of the following might happen if niacin is deficient in your diet

Which of these nerve fibres will have the highest conduction velocity

Match the vesicles, labelled a. through c., with their characteristics. (Options may be used more than once or not at all.) -contents are unloaded at a specific intracellular compartment

Secretory vesicles are released to the exterior of the cell by means of the process of phagocytosis.

All molecules greater than 0.8 nm in diameter are unable to penetrate the plasma membrane unless there is a carrier for the molecule.

A plasma membrane has a polarization if it separates particles with an opposite ____________________.

The following questions refer to comparative concentrations, permeabilities, and potentials under various circumstances. Match the relationship between the two items, A. and B.., with the qualifications labelled a. through c. (Options may be used more than once or not at all.) -a.concentration gradient for K⁺ at the equilibrium potential for K⁺ B.electrical gradient for K⁺ at the equilibrium potential for K⁺

A stimulus that is too weak to depolarize the membrane to threshold produces an action potential smaller than normal.