Question 1

After acetylcholinesterase (AChE)acts,the presynaptic neuron:

Accepted Answer

A) reabsorbs synaptic vesicles. 
B) reabsorbs the acetate. 
C) reabsorbs the choline. 
D) reabsorbs acetylcholine. 
A) reabsorbs synaptic vesicles. 
B) reabsorbs the acetate. 
C) reabsorbs the choline. 
D) reabsorbs acetylcholine.

Question 2

The majority of synapses in the nervous system are:

Accepted Answer

A) chemical. 
B) electrical. 
C) mechanical. 
D) voltage. 
A) chemical. 
B) electrical. 
C) mechanical. 
D) voltage.

Question 3

Which area on the graph shows when the neuron is in the relative refractory period?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 4

Kelly takes an antihistamine for allergies.Explain why sleepiness is a side effect of this medicine.

Accepted Answer

Antihistamines are drugs that block hist

Question 5

Saltatory conduction is slow due to the presence of insulating myelin around an axon.

Accepted Answer

A) True 
 B)False

Question 6

What membrane potential must generally be met in order to achieve threshold?

Accepted Answer

A) - 30 mV 
B) - 55 mV 
C) - 70 mV 
D) - 85 mV 
A) - 30 mV 
B) - 55 mV 
C) - 70 mV 
D) - 85 mV

Question 7

The two structural divisions of the nervous system are the:

Accepted Answer

A) central nervous system and peripheral nervous system. 
B) visceral motor division and somatic motor division. 
C) somatic sensory division and visceral sensory system. 
D) sensory division and motor division. 
A) central nervous system and peripheral nervous system. 
B) visceral motor division and somatic motor division. 
C) somatic sensory division and visceral sensory system. 
D) sensory division and motor division.

Question 8

Which of the following best describes a bipolar neuron?

Accepted Answer

A) one axon that splits into two processes 
B) one axon and one dendrite 
C) multiple axons and one dendrite 
D) one axon and multiple,highly branched dendrites 
A) one axon that splits into two processes 
B) one axon and one dendrite 
C) multiple axons and one dendrite 
D) one axon and multiple,highly branched dendrites

Question 9

Multiple sclerosis (MS)is a disease in which the myelin sheaths are destroyed in the brain and spinal cord.With what process does this interfere and what would be the consequences?

Accepted Answer

Myelin sheaths allow the action potentia

Question 10

Because of their ability to rapidly divide during brain injury,which type of neuroglial cell would be more likely to form a brain tumor?

Accepted Answer

A) Schwann cell 
B) oligodendrocyte 
C) astrocyte 
D) ependymal cell 
A) Schwann cell 
B) oligodendrocyte 
C) astrocyte 
D) ependymal cell

Question 11

Which of the following must happen first in the order events at a chemical synapse?

Accepted Answer

A) Calcium ions cause synaptic vesicles to release neurotransmitters into the synaptic cleft. 
B) Calcium ion channels in the axon terminal open. 
C) Neurotransmitter binds to receptors on the postsynaptic neuron. 
D) Ion channels respond to the neurotransmitter and lead to a local potential,or possibly an action potential. 
A) Calcium ions cause synaptic vesicles to release neurotransmitters into the synaptic cleft. 
B) Calcium ion channels in the axon terminal open. 
C) Neurotransmitter binds to receptors on the postsynaptic neuron. 
D) Ion channels respond to the neurotransmitter and lead to a local potential,or possibly an action potential.

Question 12

Acetylcholine (ACh)may excite postsynaptic neurons in the CNS; however,it may inhibit some postsynaptic neurons in the PNS.Explain how acetylcholine can be both excitatory and inhibitory.

Accepted Answer

Acetylcholine can have an excitatory eff

Question 13

A postsynaptic neuron is bombarded by synaptic inputs from several hundred presynaptic neurons.However,this neuron does not appear to transmit an impulse.Propose an explanation of why this could occur.

Accepted Answer

The input from each presynaptic neuron m

Question 14

What part of the neuron is a process that can generate and conduct action potentials?

Accepted Answer

A) dendrite 
B) axon 
C) cell body 
D) neurofibril 
A) dendrite 
B) axon 
C) cell body 
D) neurofibril

Question 15

What type of postsynaptic potential would be more likely to promote an action potential-an IPSP or EPSP? Explain.

Accepted Answer

A small,local depolarization called an E

Question 16

Within the PNS,a neuron will regenerate only if:

Accepted Answer

A) the neuron was myelinated. 
B) the surrounding neuroglia regenerate first. 
C) scar tissue is removed by phagocytosis. 
D) the cell body remains intact. 
A) the neuron was myelinated. 
B) the surrounding neuroglia regenerate first. 
C) scar tissue is removed by phagocytosis. 
D) the cell body remains intact.

Question 17

Which of the following is an effect of myelination?

Accepted Answer

A) Myelination increases the rate at which phagocytosis occurs in the brain. 
B) Myelination increases the rate of mitosis in damaged neurons. 
C) Myelination increases the volume of cerebrospinal fluid in circulation. 
D) Myelination increases the speed of conduction of action potentials. 
A) Myelination increases the rate at which phagocytosis occurs in the brain. 
B) Myelination increases the rate of mitosis in damaged neurons. 
C) Myelination increases the volume of cerebrospinal fluid in circulation. 
D) Myelination increases the speed of conduction of action potentials.

Question 18

During the absolute refractory period,production of an additional action potential is not possible no matter how strong the stimulus.

Accepted Answer

A) True 
 B)False

Question 19

What best describes a converging circuit?

Accepted Answer

A) One axon of an input neuron branches to make contact with multiple postsynaptic neurons. 
B) An increasing number of neurons are excited down the pathway of the circuit. 
C) Axon terminals from multiple input neurons join onto a single postsynaptic neuron. 
D) One neuron communicates with multiple parts of the brain. 
A) One axon of an input neuron branches to make contact with multiple postsynaptic neurons. 
B) An increasing number of neurons are excited down the pathway of the circuit. 
C) Axon terminals from multiple input neurons join onto a single postsynaptic neuron. 
D) One neuron communicates with multiple parts of the brain.

Question 20

Discuss the two main factors involved in the generation of a neuron's resting membrane potential.

Accepted Answer

The main factor is the ease at which pot

Exam 11: Introduction to the Nervous System Nervous Tissue

After acetylcholinesterase (AChE)acts,the presynaptic neuron:

The majority of synapses in the nervous system are:

Which area on the graph shows when the neuron is in the relative refractory period?

Kelly takes an antihistamine for allergies.Explain why sleepiness is a side effect of this medicine.

Saltatory conduction is slow due to the presence of insulating myelin around an axon.

What membrane potential must generally be met in order to achieve threshold?

The two structural divisions of the nervous system are the:

Which of the following best describes a bipolar neuron?

Multiple sclerosis (MS)is a disease in which the myelin sheaths are destroyed in the brain and spinal cord.With what process does this interfere and what would be the consequences?

Because of their ability to rapidly divide during brain injury,which type of neuroglial cell would be more likely to form a brain tumor?

Which of the following must happen first in the order events at a chemical synapse?

Acetylcholine (ACh)may excite postsynaptic neurons in the CNS; however,it may inhibit some postsynaptic neurons in the PNS.Explain how acetylcholine can be both excitatory and inhibitory.

A postsynaptic neuron is bombarded by synaptic inputs from several hundred presynaptic neurons.However,this neuron does not appear to transmit an impulse.Propose an explanation of why this could occur.

What part of the neuron is a process that can generate and conduct action potentials?

What type of postsynaptic potential would be more likely to promote an action potential-an IPSP or EPSP? Explain.

Within the PNS,a neuron will regenerate only if:

Which of the following is an effect of myelination?

During the absolute refractory period,production of an additional action potential is not possible no matter how strong the stimulus.

What best describes a converging circuit?

Discuss the two main factors involved in the generation of a neuron's resting membrane potential.

Introduction to Anatomy Physiology

The Chemistry of Life

The Cell

Histology

The Integumentary System

Bones and Bone Tissue

The Skeletal System

Articulations

The Muscular System

Muscle Tissue Physiology

The Central Nervous System

The Peripheral Nervous System

The Autonomic Nervous System Homeostasis

The Special Senses

The Endocrine System

The Cardiovascular System I: the Heart

The Cardiovascular System Ii: the Blood Vessels

Blood

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism and Nutrition

The Urinary System

Fluid, Electrolyte, and Acid-Base Homeostasis

The Reproductive System

Development Heredity

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Which area on the graph shows when the neuron is in the relative refractory period? $Which area on the graph shows when the neuron is in the relative refractory period?$