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Describe the steps involved in the generation of an action potential.
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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 16
State the all-or-none principle of action potentials.
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Understand that the all-or-none principle refers to how action potentials are generated in neurons or muscle cells.
Recognize that once the membrane potential reaches a certain threshold, an action potential will be triggered; if the threshold is not reached, no action potential occurs.
Know that the action potential, once initiated, always propagates along the membrane at a consistent amplitude and speed, without decreasing in strength.
Realize that this means the cell either fires a full action potential or does not fire at all—there is no partial or weaker action potential.
Summarize the principle as: an action potential either happens completely when threshold is met, or it does not happen at all if threshold is not reached.
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Action Potential
An action potential is a rapid, temporary change in the electrical membrane potential of a neuron or muscle cell, allowing the transmission of signals along the cell. It involves a sequence of depolarization and repolarization phases caused by ion movements across the membrane.
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Action Potential
All-or-None Principle
The all-or-none principle states that an action potential either occurs fully or not at all. If the stimulus reaches the threshold, a complete action potential is generated; if it does not, no action potential occurs, ensuring consistent signal strength.
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Threshold Potential
Threshold potential is the critical level of membrane depolarization that must be reached to trigger an action potential. It acts as a gatekeeper, determining whether the neuron will fire, thus playing a key role in the all-or-none response.
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01:45Graded Potentials Example 2
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