Domanda del libro di testo
During a neurobiology lecture, a professor repeatedly refers to group A and group B fibers, absolute refractory period, and myelin sheath gaps. Define these terms.
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Ch. 11 Fundamentals of the Nervous System and Nervous Tissue
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091
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TOC.tableOfContents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units24
- Ch. 4 Tissue: The Living Fabric19
- Ch. 5 The Integumentary System10
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton11
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue23
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity28
- Ch. 14 The Autonomic Nervous System18
- Ch. 16 The Endocrine System26
- Ch. 17 Blood27
- Ch. 18 The Cardiovascular System: The Heart22
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues16
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses29
- Ch. 22 The Respiratory System20
- Ch. 23 The Digestive System30
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System25
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System23
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Marieb, Hoehn 7th EditionCh. 11 Fundamentals of the Nervous System and Nervous TissueProblema 11
Marieb, Hoehn 7th EditionCh. 11 Fundamentals of the Nervous System and Nervous TissueProblema 11Capitolo 11, Problema 11
a. What is myelin?
b. How does the myelination process differ in the CNS and PNS?
Guida verificata passo dopo passo1
Step 1: Define myelin by explaining that it is a fatty, insulating layer that surrounds the axons of many neurons, which helps increase the speed of electrical signal transmission along the nerve cells.
Step 2: Describe the composition of myelin, emphasizing that it is made up primarily of lipids and proteins, and that it forms a sheath around the axon in segments separated by nodes of Ranvier.
Step 3: Explain the myelination process in the Central Nervous System (CNS), noting that oligodendrocytes are the glial cells responsible for producing myelin, and that one oligodendrocyte can myelinate multiple axons.
Step 4: Contrast this with the Peripheral Nervous System (PNS), where Schwann cells produce myelin, and each Schwann cell myelinates only a single segment of one axon.
Step 5: Summarize the functional significance of these differences, highlighting how the distinct myelination mechanisms in CNS and PNS contribute to nerve signal conduction and repair processes.
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Myelin
Myelin is a fatty, insulating layer that surrounds the axons of many neurons. It increases the speed of electrical signal transmission by enabling saltatory conduction, where impulses jump between gaps called nodes of Ranvier. This insulation is essential for efficient nervous system function.
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Propagation of Action Potentials Example 1
Myelination in the Central Nervous System (CNS)
In the CNS, myelination is performed by oligodendrocytes, which extend their processes to wrap multiple axons simultaneously. This process begins in fetal development and continues into early adulthood, contributing to neural circuit maturation and faster signal conduction.
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Myelination in the Peripheral Nervous System (PNS)
In the PNS, Schwann cells are responsible for myelination, wrapping their entire cell body around a single axon segment. This difference allows for more localized repair and regeneration after injury compared to the CNS, where myelin-producing cells have limited regenerative capacity.
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3:33Peripheral Nervous System
Pratica correlata
Domanda del libro di testo
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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Domanda del libro di testo
An IPSP is inhibitory because
a. It hyperpolarizes the postsynaptic membrane.
b. It reduces the amount of neurotransmitter released by the presynaptic terminal.
c. It prevents calcium ion entry into the presynaptic terminal.
d. It changes the threshold of the neuron.
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Domanda del libro di testo
Inhibition of acetylcholinesterase by poisoning blocks neurotransmission at the neuromuscular junction because
a. ACh is no longer released by the presynaptic terminal.
b. ACh synthesis in the presynaptic terminal is blocked.
c. ACh is not degraded, so prolonged depolarization is enforced on the postsynaptic cell.
d. ACh is blocked from attaching to the postsynaptic ACh receptors.
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Domanda del libro di testo
The anatomical region of a multipolar neuron where the AP is initiated is the
a. Soma
b. Dendrites
c. Axon's initial segment
d. Axon terminals
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Domanda del libro di testo
Since all APs generated by a given nerve fiber have the same magnitude, how does the CNS 'know' whether a stimulus is strong or weak?
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