Biol 273 Winter 2013
Biol 273 – Unit 2 Study Questions
What do we mean by central and peripheral nervous systems? How can the peripheral nervous system be
further subdivided? What are the effector organs of these subdivisions?
Describe or sketch a generalized structure of a ‘model’ neuron. What are the functions of each part?
Give examples of types of neurons grouped by a) structure and b) function.
What are glial cells? What are two types of glial cells in the PNS and four types in the CNS?
In the context of the nervous system, what is a ganglion and what is a nerve? What do the terms nuclei and tract
Resting Membrane Potential / Graded Potentials:
List the main chemical players that contribute to the electrical makeup of our bodies. In which fluid
compartments are they typically more concentrated?
Define and describe resting membrane potentials. What is/are the main factor(s) determining the resting
Distinguish between the terms depolarization, hyperpolarization and repolarization.
What is an equilibrium potential? What equation predicts the equilibrium potential for a given ion? What
equation better predicts the membrane potential when multiple ions are involved?
What do we mean when we say a membrane is selectively permeable? How does a cell change its ion
permeability? How are ion channels classified?
List three types of voltage-gated ion channels discussed so far in this course, along with where they are
expressed, and what they do.
Distinguish between graded potential and action potentials. What initiates a graded potential? Why are they
called ‘graded’? What causes graded potentials to lose strength as they move through the cytoplasm?
What is the functional significance of a trigger zone?
What is the diffe