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BIOL 246 Exam 2 (JCCC) – Correctly Answered Questions
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BIOL 246 Exam 2 (JCCC) – Correctly Answered Questions
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BIOL 246 Exam 2 (JCCC) – Correctly AnsweredQuestions
Graded potentials are Right Ans - -also called EPSP's and IPSP's
-hyperpolarize the membrane
-depolarize the membrane to the threshold voltage
-initiate an action potential
Which ion is higher in concentration inside the cell compared to outside?
Right Ans - Potassium (K+)
To increase the amount of neurotransmitter released onto a postsynaptic cell,
the presynaptic cell would have to Right Ans - do nothing; no change is
possible since the all-or-none law is in effect
If a stimulating electrode is placed in the middle of a resting axon and an
above-threshold voltage is applied to the electrode, the action potentials
Right Ans - will start at that point and travel in both directions in the axon
The ion necessary to initiate the release of acetylcholine into the synapse is
Right Ans - Calcium (Ca2+)
Inhibitory postsynaptic potentials (IPSP's) result in... Right Ans - graded
hyperpolarizations
What two things require a minimum stimulus to occur? Right Ans - action
potentials and graded potentials
_____________ originates on the dendrites Right Ans - graded potentials
The refractory period of an action potential Right Ans - ensures one-way
travel down an axon, allows a neuron to ignore a second signal sent that
closely follows the first, and prevents summation of action potentials.
Calcium is important in the synapse (interstitial fluid surrounding the neuron)
because it Right Ans - signals the exocytosis of the
ligand/neurotransmitter.
, The falling phase (repolarization) of the action potential is due primarily to
Right Ans - K+ flow out of the cell only
Identify the FALSE statement:
A) The trigger zone is the integrating center of the neuron.
B) EPSPs that reach threshold can initiate an action potential.
C) All of the statements are true.
D) IPSPs depolarize the membrane. Right Ans - D) IPSPs depolarize the
membrane
EPSP's are... Right Ans - excitatory and depolarizing (bring neuron closer to
threshold)
IPSP's are... Right Ans - inhibitory and hyperpolarizing (bring the neuron
farther from threshold)
A site of information "integration" in the neuron is the Right Ans - axon
hillock (trigger zone)
The two types of electrical signals in neurons are... Right Ans - graded
potentials and action potentials
Propagation of the action potential from the axon hillock to the axon terminal
occurs because Right Ans - a positive current from voltage-gated Na+
channels travels from one set to the next
Graded potentials can be Right Ans - excitatory OR inhibitory
The resting membrane potential in a typical nerve cell is approximately
Right Ans - -70mV
Compared to the outside surface, the inside of a resting cell membrane is
Right Ans - negatively charged
As the charge on the membrane of a typical neuron approaches 0 from -70
mV, the cell is Right Ans - depolarizing
When ligands open Na+ channels, this causes_____ at the dendrites. Right
Ans - depolarization; graded potential
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