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Because the AV node takes on the role of a very important delay in the cardiac conduction system. Without this delay, the atria and ventricles would contract at the same time.
<h3>Cardiac conduction system</h3>
The conduction system of the heart sends electrical signals, usually generated by the sinus nodes, causing the heart muscle to contract. Pacemaker signals originating from the sinus node travel through the right atrium to the atrioventricular (AV) along the bundle of His and through branches of the bundle, causing myocardial contraction. This signal first stimulates contraction of the right and left atria then flows to the right and left ventricles. That electric current then allows blood to be pumped throughout the body.
Learn more about sequence of travel by an impulse through the cardiac conduction system at brainly.com/question/28269433
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Translation I found it on quizlet
A.
Activation energy is the energy needed for a reaction
<u>Answer:</u>
The temperature in the interior of earth is very high and this high temperature causes the rocks in the interior to melt. <em>Hot fluids being less dense than cold fluid rise upwards. Thus the molten rock called magma rises up and gets stored in magma chambers. </em>
During the time of an eruption the pressure of the dissolved gases in the magma causes it flow out through fissures on mountain surfaces. The thickness of the magma decides the intensity of the volcanic eruption. <em>Gases escape easily through thin magma and the eruption will be slow and less dangerous. </em>
But if the magma is thick the dissolved gases can’t escape easily and they will build pressure on the magma and it will erupt with very high speeds destroying everything on its way. <em>Thus conducting an experimental study on a volcanic spot is practically impossible.
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