HISTOLOGY
BLOOD VESSELS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the automatism of the heart?
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Automatism of the heart lies in the ability of myocytes to contract rhythmically under the influence of impulses generated in the heart.
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the ability to beat rhythmically under the influence of impulses from the heart itself
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it is the ability of the heart muscle to be excited by various stimuli of a physical or chemical nature, accompanied by changes in the physicochemical properties of the tissue.
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is carried out in the heart electrically due to the formation of an action potential in the pacemaker cells. Nexuses serve as the place of transition of excitation from one cell to another.
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Explanation:
Detailed explanation-1: -The electrical impulse travels from the sinus node to the atrioventricular node (also called AV node). There, impulses are slowed down for a very short period, then continue down the conduction pathway via the bundle of His into the ventricles.
Detailed explanation-2: -Calcium is involved in cardiac automaticity and is required for muscle contraction. Hypocalcemia can therefore result in arrhythmias and reduced myocardial contractility.
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