What is excitability of the heart

What is excitability of the heart

Excitability of the heart @article{altshuler1956excitabilityot, title={excitability of the heart}, author={charles h.The first page of the pdf of this article appears above.The heart at the time of sir william harvey originally was thought to be an insensate organ.The muscle cells of the heart are unique and.Sa node → internodal fibers and atrial muscle.

Excitability is the ability of a cell (cardiac.This represents one of the major advances in cardiac physiology.The depolarization propagates through the myocardium similar to the spread of a wave front in water.The normal heartbeat arises from an organized flow of ionic currents across the cell.Cardiac excitability has an intuitive meaning, suggesting the ease with which cardiac cells.

What does excitability mean in biology?Cardiac excitability refers to the ease with which cardiac cells undergo a series of events characterized by sequential depolarization and repolarization, communication with adjacent cells, and propagation of the electrical activity.Certain medications (e.g., muscle relaxants, benzodiazepines)

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We address both the influence of network structure and different excitability distributions across the network on the ictogenic variance. We find that this variance depends on both network structure ...

Dopamine Increases the Intrinsic Excitability of Parvalbumin-Expressing Fast-Spiking Cells in the Piriform Cortex

However, dopamine had a striking effect on the intrinsic excitability of the parvalbumin-expressing fast-spiking (FS) class of GABAergic interneuron. Dopamine depolarized the resting potential, ...

Nonuniform Recovery of Excitability in Ventricular Muscle

JAOK HAN, M.D., Ph.D. and GORDON K. MOE, M.D., Ph.D. Recovery of excitability of ventricular muscle was measured at numerous points in exposed dog ventricles at varying distances along six radial axes ...

Electrical Excitability of Atrioventricular Nodal Cells

Recovery of excitability was delayed well beyond repolarization; in cells of the midnodal region, "diastolic" threshold was not attained until 0.2 to 0.5 seconds after restoration of resting membrane ...

Sleep-dependent upscaled excitability, saturated neuroplasticity, and modulated cognition in the human brain

Specifically, we monitored cortical excitability of the brain via TMS protocols that measure cortical inhibition and facilitation (i) and induced both LTP-like and LTD-like plasticity (ii). We ...

Examples of 'neuronal excitability' in a sentence

We welcome feedback: report an example sentence to the Collins team. Read more… Cardiac f- and their neuronal relatives h-channels play a key role in the control of heart rate and neuronal ...

Examples of 'neuronal excitability' in a sentence

Cardiac f- and their neuronal relatives h-channels play a key role in the control of heart rate and neuronal excitability.

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Experimental studies have shown that patients with chronic pancreatitis show signs of spinal hyper-excitability counter-balanced by segmental and descending inhibition. Changes in the brain with ...

Biophysical Kv3 channel alterations dampen excitability of cortical PV interneurons and contribute to network hyperexcitability in early Alzheimer's

Parvalbumin (PV) interneurons are potential candidates for dysregulating cortical excitability, as they display altered AP firing before neighboring excitatory neurons in prodromal AD. Here we report ...

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it may be that its modulation influences the degree of excitability in the spinal cord in response to cough stimuli.17 A last factor to bear in mind is the descending control on the nucleus tractus ...