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What is the difference between temporal summation and spatial summation?
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Ch. 12 Nervous Tissue
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089
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TOC.tableOfContents
- Ch. 1 An Introduction to Anatomy and Physiology26
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization30
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure36
- Ch. 7 The Axial Skeleton11
- Ch. 8 The Appendicular Skeleton17
- Ch. 9 Joints13
- Ch. 10 Muscle Tissue12
- Ch. 11 The Muscular System28
- Ch. 12 Nervous Tissue18
- Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes22
- Ch. 14 The Brain and Cranial Nerves20
- Ch. 15 Sensory Pathways and the Somatic Nervous System17
- Ch. 16 The Autonomic Nervous System and Higher-Order Functions30
- Ch. 17 The Special Senses16
- Ch. 18 The Endocrine System20
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation29
- Ch. 22 The Lymphatic System and Immunity31
- Ch. 23 The Respiratory System12
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes32
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance23
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Non è quello che usi tu?Cambia libro di testo
Capitolo 12, Problema 25
What factor determines the maximum frequency of action potentials that could be propagated by an axon?
Guida verificata passo dopo passo1
Understand that the maximum frequency of action potentials an axon can propagate is primarily limited by the refractory periods of the neuron.
Recall that there are two refractory periods: the absolute refractory period, during which no new action potential can be initiated, and the relative refractory period, during which a stronger-than-normal stimulus is required.
Recognize that the absolute refractory period sets the minimum time interval between two consecutive action potentials, thus determining the maximum firing frequency.
Express the maximum frequency mathematically as the reciprocal of the absolute refractory period: \(\text{Maximum Frequency} = \frac{1}{\text{Absolute Refractory Period}}\).
Consider that factors affecting the duration of the refractory period, such as ion channel kinetics and axon properties, will influence the maximum frequency of action potentials.
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Refractory Period
The refractory period is the time after an action potential during which a neuron is unable or less able to fire another action potential. It includes the absolute refractory period, where no new action potential can be initiated, and the relative refractory period, where initiation is possible but requires a stronger stimulus. This period limits the maximum frequency of action potentials.
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Refractory Period
Ion Channel Dynamics
Ion channels, especially voltage-gated sodium and potassium channels, control the initiation and propagation of action potentials. Their opening and closing kinetics determine how quickly a neuron can reset after an action potential, influencing the refractory period and thus the maximum firing frequency.
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Axonal Membrane Properties
The physical and electrical properties of the axonal membrane, such as capacitance and resistance, affect how quickly the membrane potential can change. These properties influence the speed of repolarization and recovery, thereby impacting the maximum rate at which action potentials can be propagated.
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