Question 1

The neuron that receives neurotransmitters from another neuron is called:

Accepted Answer

A) an oligodendrocyte. 
B) the presynaptic neuron. 
C) a Schwann cell. 
D) the postsynaptic neuron. 
A) an oligodendrocyte. 
B) the presynaptic neuron. 
C) a Schwann cell. 
D) the postsynaptic neuron.

Question 2

The most common type of neuron in the human body is:

Accepted Answer

A) pseudounipolar. 
B) unipolar. 
C) multipolar. 
D) bipolar. 
A) pseudounipolar. 
B) unipolar. 
C) multipolar. 
D) bipolar.

Question 3

Graded potentials:

Accepted Answer

A) produce an effect that increases with distance from the point of stimulation. 
B) may cause either depolarization or hyperpolarization. 
C) produce an effect that spreads actively across the membrane surface. 
D) cause repolarization. 
A) produce an effect that increases with distance from the point of stimulation. 
B) may cause either depolarization or hyperpolarization. 
C) produce an effect that spreads actively across the membrane surface. 
D) cause repolarization.

Question 4

During repolarization of a neuron:

Accepted Answer

A) potassium ions move into the cell. 
B) sodium ions move into the cell. 
C) sodium ions move out of the cell. 
D) potassium ions move out of the cell. 
A) potassium ions move into the cell. 
B) sodium ions move into the cell. 
C) sodium ions move out of the cell. 
D) potassium ions move out of the cell.

Question 5

Voltage-gated sodium channels are activated:

Accepted Answer

A) during repolarization. 
B) after voltage-gated potassium channels are activated. 
C) only if the cell is depolarized to threshold. 
D) during hyperpolarization. 
A) during repolarization. 
B) after voltage-gated potassium channels are activated. 
C) only if the cell is depolarized to threshold. 
D) during hyperpolarization.

Question 6

When is the generation of an action potential impossible,no matter the strength of the stimulus?

Accepted Answer

A) relative refractory period 
B) absolute refractory period 
C) threshold 
D) depolarization 
A) relative refractory period 
B) absolute refractory period 
C) threshold 
D) depolarization

Question 7

What is NOT associated with a chemical synapse?

Accepted Answer

A) neurotransmitter 
B) presynaptic neuron 
C) synaptic cleft 
D) gap junction 
A) neurotransmitter 
B) presynaptic neuron 
C) synaptic cleft 
D) gap junction

Question 8

What type of neuron,found within the CNS,performs the job of information processing?

Accepted Answer

A) sensory (afferent)neurons 
B) interneurons (association neurons) 
C) bipolar neurons 
D) motor (efferent)neurons 
A) sensory (afferent)neurons 
B) interneurons (association neurons) 
C) bipolar neurons 
D) motor (efferent)neurons

Question 9

The same__________ can have different effects depending on the properties of the .

Accepted Answer

A) neurotransmitter; receptor 
B) receptor; neurotransmitter 
C) substrate; enzyme 
D) hormone; neurotransmitter 
A) neurotransmitter; receptor 
B) receptor; neurotransmitter 
C) substrate; enzyme 
D) hormone; neurotransmitter

Question 10

Saltatory conduction occurs:

Accepted Answer

A) when myelin sheaths are present. 
B) in gray matter. 
C) when threshold has not yet been reached. 
D) when myelin sheaths are absent. 
A) when myelin sheaths are present. 
B) in gray matter. 
C) when threshold has not yet been reached. 
D) when myelin sheaths are absent.

Question 11

If a resting axon increases its permeability to sodium ions:

Accepted Answer

A) the membrane potential will hyperpolarize. 
B) the influx of sodium ions will increase and the membrane will depolarize. 
C) the outward movement of sodium ions will decrease. 
D) the membrane potential will repolarize. 
A) the membrane potential will hyperpolarize. 
B) the influx of sodium ions will increase and the membrane will depolarize. 
C) the outward movement of sodium ions will decrease. 
D) the membrane potential will repolarize.

Question 12

Repolarization begins as:

Accepted Answer

A) voltage-gated potassium ion channels activate. 
B) voltage-gated sodium ion channels activate. 
C) voltage-gated potassium ion channels begin to close. 
D) sodium ions follow their electrochemical gradient into the cell. 
A) voltage-gated potassium ion channels activate. 
B) voltage-gated sodium ion channels activate. 
C) voltage-gated potassium ion channels begin to close. 
D) sodium ions follow their electrochemical gradient into the cell.

Question 13

Electrical synapses are faster than chemical synapses due to the presence of gap junctions between cells.

Accepted Answer

A) True 
 B)False

Question 14

Conduction speed of a nerve impulse is influenced by the diameter of the axon and the presence or absence of a myelin sheath.

Accepted Answer

A) True 
 B)False

Question 15

Why is a neuron unable to produce an additional action potential during the absolute refractory period?

Accepted Answer

During the absolute refractory period,so

Question 16

During the absolute refractory period:

Accepted Answer

A) sodium ion channels are in their resting state (closed). 
B) no additional stimulus,no matter how strong,can produce an additional action potential. 
C) each stimulus produces an action potential. 
D) a strong stimulus can produce an action potential. 
A) sodium ion channels are in their resting state (closed). 
B) no additional stimulus,no matter how strong,can produce an additional action potential. 
C) each stimulus produces an action potential. 
D) a strong stimulus can produce an action potential.

Question 17

Which of the following is the most important excitatory neurotransmitter in the brain?

Accepted Answer

A) glutamate 
B) glycine 
C) GABA 
D) dopamine 
A) glutamate 
B) glycine 
C) GABA 
D) dopamine

Question 18

Discuss the neuroglial cells that form the myelin sheaths in the CNS and the PNS and discuss some of their differences.

Accepted Answer

Oligodendrocytes wrap the axons of certa

Question 19

Summarize the differences between the somatic motor division and the autonomic nervous system.

Accepted Answer

The somatic motor division consists of n

Question 20

Myelinated axons in the CNS are known as:

Accepted Answer

A) internodes. 
B) white matter. 
C) gray matter. 
D) dark matter. 
A) internodes. 
B) white matter. 
C) gray matter. 
D) dark matter.

Exam 11: Introduction to the Nervous System Nervous Tissue

The neuron that receives neurotransmitters from another neuron is called:

The most common type of neuron in the human body is:

Graded potentials:

During repolarization of a neuron:

Voltage-gated sodium channels are activated:

When is the generation of an action potential impossible,no matter the strength of the stimulus?

What is NOT associated with a chemical synapse?

What type of neuron,found within the CNS,performs the job of information processing?

The same__________ can have different effects depending on the properties of the .

Saltatory conduction occurs:

If a resting axon increases its permeability to sodium ions:

Repolarization begins as:

Electrical synapses are faster than chemical synapses due to the presence of gap junctions between cells.

Conduction speed of a nerve impulse is influenced by the diameter of the axon and the presence or absence of a myelin sheath.

Why is a neuron unable to produce an additional action potential during the absolute refractory period?

During the absolute refractory period:

Which of the following is the most important excitatory neurotransmitter in the brain?

Discuss the neuroglial cells that form the myelin sheaths in the CNS and the PNS and discuss some of their differences.

Summarize the differences between the somatic motor division and the autonomic nervous system.

Myelinated axons in the CNS are known as:

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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