Ch. 43 - Animal Nervous Systems

Freeman - Biological Science 8th Edition

Freeman8th EditionBiological ScienceISBN: 9780138276263Non è quello che usi tu?Cambia libro di testo

Freeman 8th Edition

Ch. 43 - Animal Nervous Systems

Problema 1

Capitolo 43, Problema 1

Which ion most readily leaks across a neuron's membrane, helping to establish the resting potential?

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Identify the key ions involved in neuronal function: Sodium (Na+), Potassium (K+), Chloride (Cl-), and Calcium (Ca2+).

Understand the role of the neuron's membrane in ion movement: The neuron's membrane is selectively permeable, allowing some ions to pass more easily than others.

Recognize the importance of potassium (K+) in establishing the resting potential: Potassium ions have channels that are typically more permeable than those for other ions, allowing K+ to leak out of the neuron more readily.

Consider the electrochemical gradient: Potassium ions move out of the neuron, down their concentration gradient, which contributes to the negative charge inside the neuron relative to the outside.

Conclude that Potassium (K+) is the ion that most readily leaks across a neuron's membrane, helping to establish the resting potential.

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Resting Potential

Resting potential refers to the electrical charge difference across a neuron's membrane when it is not actively transmitting a signal. This potential is typically around -70 mV and is maintained by the distribution of ions, particularly sodium (Na+) and potassium (K+), across the membrane. The resting potential is crucial for the generation of action potentials, which are necessary for neuronal communication.

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09:55

Action Potential

Ion Channels

Ion channels are protein structures embedded in the cell membrane that allow specific ions to pass in and out of the neuron. These channels can be voltage-gated or leak channels, with leak channels being responsible for the passive movement of ions, such as potassium (K+), which predominantly leaks out of the neuron, contributing to the resting potential. The selective permeability of these channels is vital for maintaining the resting state of the neuron.

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08:38

Ion Channels and Pumps

Potassium Ions (K+)

Potassium ions (K+) are the primary ions that leak across the neuron's membrane, significantly influencing the resting potential. Due to a higher concentration of K+ inside the neuron compared to the outside, K+ ions tend to diffuse out through leak channels. This efflux of K+ contributes to the negative charge inside the neuron, establishing the resting potential and preparing the neuron for potential action potentials.

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04:08

r/K Selection

Pratica correlata

Domanda del libro di testo

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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Domanda del libro di testo

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

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Domanda del libro di testo

Which of the following brain regions is responsible for the formation of new memories?

a. Brainstem

b. Cerebellum

c. Frontal lobe

d. Hippocampus

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