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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Autorhythmicity is a term that refers to the heart's inherent ability to generate electrical signals and instigate muscle contractions. This self-regulating conduction system within the heart consists of two key components: the pacemaker cells and specialized conducting cells.
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The cardiac conduction system produces and transmits electrical impulses that prompt myocardial contraction, ensuring efficient heart function. This intricate system ensures that the heart beats in a coordinated and efficient manner, beginning with the atria and then the ventricles. The conduction system optimizes cardiac output by maintaining this precise sequence, which is crucial for adequate blood circulation.
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Neuromuscular Junction And Blockade01:29

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The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
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Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
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[Morphologic basis of conduction block].

A Ohnishi

    Rinsho Shinkeigaku = Clinical Neurology
    |December 1, 1991
    PubMed
    Summary
    This summary is machine-generated.

    Conduction block, a key pathologic condition in nervous system disorders, often results from peripheral nerve injuries. Morphological studies reveal axoglial junction disruption and nodal axolemma abnormalities as primary causes.

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    Area of Science:

    • Neuroscience
    • Pathology
    • Electrophysiology

    Context:

    • Conduction block is a significant electrophysiologically defined pathological condition affecting both central and peripheral nervous systems.
    • It is frequently observed in peripheral nerve injuries, commonly caused by compression and ischemia.
    • While direct morphological study in human cases is challenging, experimental models provide insights into the underlying alterations.

    Purpose:

    • To elucidate the morphological underpinnings of conduction block in myelinated nerve fibers.
    • To identify the primary causes of conduction block, distinguishing between axoglial junction issues and nodal axolemma abnormalities.
    • To correlate clinical and experimental conditions with the observed pathological features.

    Summary:

    • Conduction block is primarily caused by the disturbance or destruction of the axoglial junction, leading to paranodal and segmental demyelination.
    • Compensatory increases in sodium channels may facilitate conduction across demyelinated segments.
    • Abnormalities in the nodal axolemma, including sodium channel dysfunction or loss, represent another significant cause, though harder to detect morphologically.

    Impact:

    • Provides a clearer morphological understanding of conduction block, aiding in diagnosis and research.
    • Highlights the distinct and potentially concomitant roles of axoglial junction integrity and nodal sodium channel function.
    • Facilitates the study of various clinical and experimental conditions associated with conduction block.