Question 1

Which of the following correctly describes a graded potential?

Accepted Answer

A)  it has a depolarization, repolarization and hyperpolarization phase 
B)  it can have amplitudes of various sizes 
C)  it is initiated by voltage changes in the membrane 
D)  it travels long distances

Question 2

Nerve impulses are sent to slow the heart's rate of contraction.The nerve fibers sending these signals will most likely belong to which division of the nervous system?

Accepted Answer

A)  sensory (afferent) division 
B)  somatic nervous system 
C)  sympathetic division 
D)  parasympathetic division

Question 3

Which of the following is false or incorrect?

Accepted Answer

A)  An excitatory postsynaptic potential occurs if the excitatory effect is greater than the inhibitory effect but less than threshold. 
B)  An inhibitory postsynaptic potential occurs if the inhibitory effect is greater than the excitatory, causing hyperpolarization of the membrane. 
C)  A nerve impulse occurs if the excitatory and inhibitory effects are equal.

Question 4

Figure 11.1
Using Figure 11.1, match the following:
-Which is by far the most common neuron type?

Accepted Answer

A) C 
B) B 
C) A

Question 5

Match the following:
-Involved in control of rhythmic activities such as breathing.

Accepted Answer

A) Parallel after-discharge circuit 
B) Reverberating circuit 
C) Diverging circuit 
D) Converging circuit

Question 6

Which of the following describes the excitatory postsynaptic potential?

Accepted Answer

A)  moves membrane potential away from threshold 
B)  opens K+ or Cl- channels 
C)  short distance depolarization 
D)  short distance hyperpolarization

Question 7

Figure 11.2
Using Figure 11.2, match the following:
-Ion channel.

Accepted Answer

A) C 
B) E 
C) B 
D) D 
E) A

Question 8

During the relative refractory period of an action potential,a larger than normal stimulus is needed to cause another action potential.This is due to the fact that ________.

Accepted Answer

A)  the voltage gated potassium ion channels remain open long enough to hyperpolarize the axon membrane 
B)  the membrane is now impermeable to all ions 
C)  the sodium potassium pump will stop working during relative refractory 
D)  the inactivation gates on voltage gated sodium ion channels are closed

Question 9

When a sensory neuron is excited by some form of energy,the resulting graded potential is called a(n)________.

Accepted Answer

A)  action potential 
B)  excitatory potential 
C)  postsynaptic potential 
D)  generator potential

Question 10

In myelinated axons the voltage-regulated sodium channels are concentrated at the nodes of Ranvier.

Accepted Answer

A) True 
 B)False

Question 11

Figure 11.1
Using Figure 11.1, match the following:
-Which neuron is typically involved in the special senses of sight and smell?

Accepted Answer

A) C 
B) B 
C) A

Question 12

Bacteria in the blood can be prevented entry to the fluids surrounding the brain.Which cells are most responsible for preventing bacteria from entering the fluids of the brain?

Accepted Answer

A)  satellite cells 
B)  astrocytes 
C)  Schwann cells 
D)  oligodendrocytes

Question 13

Neurons in the CNS are organized into functional groups.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is true about the movement of ions across excitable living membranes?

Accepted Answer

A)  Ions always move actively across membranes through leakage channels. 
B)  Sodium gates in the membrane can open in response to electrical potential changes. 
C)  Ions always move from an area of higher concentration to an area of lower concentration. 
D)  Ions always move passively across membranes.

Question 15

A postsynaptic potential is a graded potential that is the result of a neurotransmitter released into the synapse between two neurons.

Accepted Answer

A) True 
 B)False

Question 16

Figure 11.1
Using Figure 11.1, match the following:
-In a reflex arc,which neuron has its cell body inside the spinal cord?

Accepted Answer

A) C 
B) B 
C) A

Question 17

The concentration of ions in the chemical environment surrounding the neurons must be tightly regulated for neurons to function properly.Which of the following cells is most responsible for this?

Accepted Answer

A)  satellite cells 
B)  astrocytes 
C)  Schwann cells 
D)  oligodendrocytes

Question 18

When information is delivered within the CNS simultaneously by different parts of the neural pathway,the process is called ________ processing.

Accepted Answer

The answer of When information is delivered within the CNS...

Question 19

An inhibitory postsynaptic potential (IPSP)is associated with ________.

Accepted Answer

A)  lowering the threshold for an action potential to occur 
B)  a change in sodium ion permeability 
C)  hyperpolarization 
D)  opening of voltage-regulated channels

Question 20

The effect of acetylcholine can be stimulating or inhibiting.Which of the following gives the best explanation for why this is so?

Accepted Answer

A)  Acetylcholine has many different forms. 
B)  Acetylcholine has a "dose effect". Larger doses are stimulating while small doses inhibit. 
C)  Postsynaptic cells have a dynamic and changing metabolism and respond differently at different times. 
D)  Different post synaptic cells will have different receptors.

Exam 11: Fundamentals of the Nervous System and Nervous Tissue

Which of the following correctly describes a graded potential?

Nerve impulses are sent to slow the heart's rate of contraction.The nerve fibers sending these signals will most likely belong to which division of the nervous system?

Which of the following is false or incorrect?

Figure 11.1 Using Figure 11.1, match the following: -Which is by far the most common neuron type?

Match the following: -Involved in control of rhythmic activities such as breathing.

Which of the following describes the excitatory postsynaptic potential?

Figure 11.2 Using Figure 11.2, match the following: -Ion channel.

During the relative refractory period of an action potential,a larger than normal stimulus is needed to cause another action potential.This is due to the fact that ________.

When a sensory neuron is excited by some form of energy,the resulting graded potential is called a(n) ________.

In myelinated axons the voltage-regulated sodium channels are concentrated at the nodes of Ranvier.

Figure 11.1 Using Figure 11.1, match the following: -Which neuron is typically involved in the special senses of sight and smell?

Bacteria in the blood can be prevented entry to the fluids surrounding the brain.Which cells are most responsible for preventing bacteria from entering the fluids of the brain?

Neurons in the CNS are organized into functional groups.

Which of the following is true about the movement of ions across excitable living membranes?

A postsynaptic potential is a graded potential that is the result of a neurotransmitter released into the synapse between two neurons.

Figure 11.1 Using Figure 11.1, match the following: -In a reflex arc,which neuron has its cell body inside the spinal cord?

The concentration of ions in the chemical environment surrounding the neurons must be tightly regulated for neurons to function properly.Which of the following cells is most responsible for this?

When information is delivered within the CNS simultaneously by different parts of the neural pathway,the process is called ________ processing.

An inhibitory postsynaptic potential (IPSP) is associated with ________.

The effect of acetylcholine can be stimulating or inhibiting.Which of the following gives the best explanation for why this is so?