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
Hoehn, Haynes, Abbott12th EditionMarieb Human Anatomy & PhysiologyISBN: 9780138242732
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TOC.tableOfContents
- Ch. 1 The Human Body: An Orientation25
- Ch. 2 Chemistry Comes Alive24
- Ch. 3 Cells: The Living Units24
- Ch. 4 Tissue: The Living Fabric19
- Ch. 5 The Integumentary System12
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton14
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System25
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue23
- Ch. 12 The Central Nervous System25
- Ch. 13 The Peripheral Nervous System and Reflex Activity30
- Ch. 14 The Autonomic Nervous System16
- Ch. 15 The Special Senses26
- Ch. 16 The Endocrine System26
- Ch. 17 Blood27
- Ch. 18 The Cardiovascular System: The Heart25
- 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 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
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Hoehn, Haynes, Abbott 12th EditionCh. 11 Fundamentals of the Nervous System and Nervous TissueProblema 16
Hoehn, Haynes, Abbott 12th EditionCh. 11 Fundamentals of the Nervous System and Nervous TissueProblema 16Capitolo 11, Problema 16
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?
Guida verificata passo dopo passo1
For part (a), start by defining the cell body (also called the soma) of a neuron. Explain that it contains the nucleus and most of the organelles, such as mitochondria, ribosomes, and endoplasmic reticulum, which are essential for the neuron's metabolic activities and protein synthesis.
Next, describe the function of the cell body, emphasizing that it integrates incoming signals from the dendrites and generates outgoing signals to the axon. It also maintains the neuron's health and supports its overall function.
For part (b), begin by identifying the similarities between axons and dendrites: both are extensions of the neuron that conduct electrical signals and are covered by the plasma membrane with cytoplasm inside.
Then, explain the structural differences: dendrites are typically short, branched, and numerous, while axons are usually long, singular, and may have branches called axon collaterals. Also, dendrites have a rough surface due to synaptic inputs, whereas axons have a smooth surface.
Finally, discuss the functional differences: dendrites receive incoming signals from other neurons and transmit them toward the cell body, whereas axons carry outgoing signals away from the cell body to other neurons, muscles, or glands.
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Cell Body (Soma) Composition and Function
The cell body, or soma, contains the nucleus and cytoplasm with organelles like mitochondria and ribosomes. It integrates incoming signals and maintains cell health by producing proteins and energy necessary for neuron function.
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05:33
Cell Junctions
Structure and Function of Axons
Axons are long, slender projections that transmit electrical impulses away from the cell body to other neurons or muscles. They often have myelin sheaths to speed signal conduction and end in terminal branches for communication.
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Percorso guidato
06:04Functional Groups
Structure and Function of Dendrites
Dendrites are branched extensions from the cell body that receive incoming signals from other neurons. They have numerous receptors and increase the surface area for synaptic input, playing a key role in signal integration.
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Percorso guidato
06:04Functional Groups
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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a. Contrast unipolar, bipolar, and multipolar neurons structurally.
b. Indicate where each is most likely to be found.
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Describe the events that must occur to generate an AP. Relate the sequence of changes in permeability to changes in the ion channels, and explain why the AP is an all-or-none phenomenon.
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What is the polarized membrane state? How is it maintained? (Note the relative roles of both passive and active mechanisms.)
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