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Autorhythmicity is the tendency for the sinoatrial node of the heart to have a low threshold for depolarization leading to the heart contracting on a regular basis, i.e. in a regular rhythm, without external stimulus from the nervous system.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoa pacemaker that initiated each contraction of a heart beat
"Autorhythmic cells: cardiac or smooth muscle fibers that are self-excitable; act as the heart's pacemaker and conduct the pacing impulse through the conduction system of the heart; self-excitable neurons in central nervous system,as in the inspiratory area of the brain stem." -Principles of Anotomy and physiology, TORTORA, DERRICKSON, 11th edition, Wiley & sons, Inc. (c) 2006 by bio. Sci. textbooks, Inc. and Bryan Derrickson
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Does the skeletal muscle exhibits autorhythmicity?
yes
The term means the cells set their own rhythm?
Autorhythmicity - seen in cardiac muscle cells.
What you mean by autorhythmicity?
The pacemaker is known as the SA node (sinotrial) and it generates action potentials to the AV node and then to the bundle of his down to the purkinje fibers. The branching of cardiac muscle tissue and the intercalated discs allow action potentials to propagate to other cardiac mt cells. The autorhythmicity of the heart is attributed to the fact that it creates its own action potentials from the SA node and can be generated independently from the rest of the body. The heart's autorhythmicity also prevents it from reaching tetanus (like a skeletal muscle does), because myocardial tissue only allows a certain amount of action potentials through before it reaches its absolute refractory period when it comes to a plateau and after the wave drops again and gets hit with another action potential it has already rested.
What are pacemaker cells in the human body?
They Are A Special Group Of Nerve Cells. Nerve Signals From The Brain Control The Pacemaker, Making It Go Faster Or Slower When Required. Specialist cells in the heart which have autorhythmicity.
What controls the rate and rhythm of the heart beat?
A region in the upper left hand corner of the heart is considered the pacemaker. Those cells exhibit autorhythmicity. That means these cells have the ability to initiate their won action potential and the heart can beat on its own. The endocrine and autonomic nervous system can influence the rate but the heart controls its own beat.
Are cardiac muscles voluntary?
No, your heart muscles contract without voluntary input. Therefore they are involuntary muscles. The regular heart beat is stimulated within the SA node of the heart, this is known as autorhythmicity.
What is the medical term meaning built-in or intrinsic rhythm of heart contractions?
AutorhythmicityThe heart is made of tissue that is specific to the cardiac muscle. The beating of the heart, in most healthy individuals, intrinsically arises in the SA (sino atrial node) in the upper right chamber of the heart. A normal resting heart rate is commonly considered to be between 60 and 100 beats per minute. In some very well trained athletes or in periods of meditation a normal resting heart rate may be less than 60.
