Textbook Question
The velocity of nerve impulse conduction is greatest in
a. Heavily myelinated, large-diameter fibers
b. Myelinated, small-diameter fibers
c. Nonmyelinated, small-diameter fibers
d. Nonmyelinated, large-diameter fibers
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Ch. 11 Fundamentals of the Nervous System and Nervous Tissue
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034
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Table of contents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units21
- Ch. 4 Tissue: The Living Fabric20
- Ch. 5 The Integumentary System11
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton14
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue19
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity32
- Ch. 14 The Autonomic Nervous System19
- Ch. 15 The Special Senses26
- Ch. 16 The Endocrine System23
- Ch. 17 Blood25
- Ch. 18 The Cardiovascular System: The Heart24
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues14
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses27
- Ch. 22 The Respiratory System21
- Ch. 23 The Digestive System31
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System26
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System24
- Ch. 28 Pregnancy and Human Development25
- Ch. 29 Heredity11
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Not the one you use?Change textbook
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Marieb, Hoehn 11th EditionCh. 11 Fundamentals of the Nervous System and Nervous TissueProblem 17
Marieb, Hoehn 11th EditionCh. 11 Fundamentals of the Nervous System and Nervous TissueProblem 17Chapter 11, Problem 17
a. Contrast unipolar, bipolar, and multipolar neurons structurally.
b. Indicate where each is most likely to be found.
Verified step by step guidance1
Step 1: Define each type of neuron based on the number of processes extending from the cell body. A unipolar neuron has a single process, a bipolar neuron has two processes, and a multipolar neuron has multiple processes (one axon and multiple dendrites).
Step 2: Describe the structural characteristics of a unipolar neuron: it has one short process that branches into two directions, functioning as both an axon and dendrite, commonly found in sensory neurons of the peripheral nervous system.
Step 3: Describe the structural characteristics of a bipolar neuron: it has two distinct processes, one axon and one dendrite, extending from opposite ends of the cell body, typically found in sensory organs such as the retina of the eye and the olfactory epithelium.
Step 4: Describe the structural characteristics of a multipolar neuron: it has one axon and multiple dendrites extending from the cell body, allowing integration of a large amount of information, and is the most common neuron type found in the central nervous system, including motor neurons and interneurons.
Step 5: Summarize the typical locations: unipolar neurons are mainly in sensory ganglia of the peripheral nervous system, bipolar neurons are found in specialized sensory organs, and multipolar neurons are predominant in the brain and spinal cord.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Structural Characteristics of Unipolar, Bipolar, and Multipolar Neurons
Unipolar neurons have a single process extending from the cell body that splits into two branches, bipolar neurons have one axon and one dendrite extending from opposite ends of the cell body, and multipolar neurons have one axon and multiple dendrites. These structural differences influence their function and connectivity.
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Characteristic 1: Polarity
Functional Roles and Locations of Unipolar Neurons
Unipolar neurons are primarily sensory neurons found in the peripheral nervous system, especially in dorsal root ganglia. Their structure allows rapid transmission of sensory information from the body to the central nervous system.
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Functional Roles and Locations of Bipolar and Multipolar Neurons
Bipolar neurons are typically found in sensory organs like the retina and olfactory epithelium, where they transmit special sensory information. Multipolar neurons, the most common type, are found in the central nervous system and function mainly as motor neurons or interneurons, integrating and transmitting signals.
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Related Practice
Textbook Question
When admitted to the emergency room, Sean was holding his right hand, which had a deep puncture hole in its palm. He explained that he had fallen on a nail while exploring a barn. Sean was given an antitetanus shot to prevent neural complications. Tetanus bacteria fester in deep, dark wounds, but how do their toxins travel in neural tissue?
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Textbook Question
a. Describe the composition and function of the cell body.
b. How are axons and dendrites alike? In what ways (structurally and functionally) do they differ?
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Textbook Question
The effects of neurotransmitter binding are very brief. Explain.
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Textbook Question
What is the polarized membrane state? How is it maintained? (Note the relative roles of both passive and active mechanisms.)
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