Textbook Question
Describe the role of summation in postsynaptic cells.
Ch. 43 - Animal Nervous Systems
Freeman8th EditionBiological ScienceISBN: 9780138276263
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Table of contents
- Ch. 1 - Biology: The Study of Life13
- Ch. 2 - Water and Carbon: The Chemical Basis of Life14
- Ch.3 - Protein Structure and Function10
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells11
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation11
- Ch. 10 - Photosynthesis12
- Ch. 11 - Cell-Cell Interactions12
- Ch. 12 - The Cell Cycle8
- Ch. 13 - Meiosis12
- Ch. 14 - Mendel and the Gene23
- Ch. 15 - DNA and the Gene: Synthesis and Repair15
- Ch. 16 - How Genes Work16
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria16
- Ch. 19 - Control of Gene Expression in Eukaryotes12
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers15
- Ch. 21 - Genes, Development, and Evolution12
- Ch. 22 - Evolution by Natural Selection16
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea15
- Ch. 27 - Diversification of Eukaryotes16
- Ch. 28 - Green Algae and Land Plants16
- Ch. 29 - Fungi18
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals15
- Ch. 32 - Deuterostome Animals17
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function17
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development16
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology15
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology17
- Ch. 54 - Biodiversity and Conservation Ecology18
Chapter 43, Problem 5
Explain the difference between a ligand-gated K+ channel and a voltage-gated K+ channel.
Verified step by step guidance1
Understand the basic function of ion channels: Ion channels are proteins that allow ions to pass through the cell membrane, playing a crucial role in cell signaling and homeostasis.
Define ligand-gated channels: Ligand-gated channels open or close in response to the binding of a specific molecule, known as a ligand, which can be a neurotransmitter or hormone.
Define voltage-gated channels: Voltage-gated channels open or close in response to changes in the electrical potential across the cell membrane.
Compare the activation mechanisms: Ligand-gated K+ channels require the binding of a ligand to change their conformation and allow K+ ions to pass through, whereas voltage-gated K+ channels respond to changes in membrane potential to open or close.
Discuss the physiological roles: Ligand-gated K+ channels are often involved in synaptic transmission and cellular signaling, while voltage-gated K+ channels are crucial for action potential propagation and regulating neuronal excitability.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Ligand-Gated Ion Channels
Ligand-gated ion channels are a type of membrane protein that open or close in response to the binding of a specific chemical messenger, or ligand, such as a neurotransmitter. This binding alters the channel's conformation, allowing ions to pass through the membrane, which can initiate a cellular response. These channels are crucial in synaptic transmission and cellular signaling.
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Voltage-Gated Ion Channels
Voltage-gated ion channels are membrane proteins that open or close in response to changes in the electrical potential across the cell membrane. These channels are essential for the propagation of action potentials in neurons and muscle cells, as they allow ions to flow in response to voltage changes, facilitating rapid communication and contraction processes.
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Potassium Ion Channels
Potassium ion channels are a class of ion channels that selectively allow potassium ions (K+) to pass through the cell membrane. They play a critical role in maintaining the cell's resting membrane potential and in repolarizing the membrane after an action potential. The specific gating mechanism, whether ligand or voltage, determines how these channels are activated and contribute to cellular function.
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Related Practice
Textbook Question
Which of these statements about myelination in neurons is/are correct? Select True or False for each statement.
T/FIt speeds propagation by increasing the density of voltage-gated channels all along the axon.
T/FMultiple sclerosis is characterized by disrupted myelination of certain neurons in the central nervous system.
T/FIt speeds propagation by preventing cations from leaking out across the membrane as they spread down the axon.
T/FIt is more commonly observed in vertebrates than in invertebrates.
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Textbook Question
Why is memory thought to involve changes in particular synapses?
a. At some synapses, more neurotransmitters are released after learning takes place.
b. At some synapses, a different type of neurotransmitter is released after learning takes place.
c. When researchers stimulated certain neurons electrically, individuals replayed memories.
d. When researchers changed synapses in the brains of patients during surgery, the patients' memories changed.
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Textbook Question
In a neuron, what creates the electrochemical gradient favoring the outflow of K+ when the cell is at rest?
a. Na+/K+-ATPase
b. Voltage-gated K+ channels
c. Voltage-gated Na+ channels
d. Ligand-gated Na+/K+ channels
Textbook Question
Which of the following brain regions is responsible for the formation of new memories?
a. Brainstem
b. Cerebellum
c. Frontal lobe
d. Hippocampus
Textbook Question
Compare and contrast the somatic nervous system and autonomic nervous system.