of convection triggered by heating from below in a two-layer system First of.
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The possible functional significance of some of these anatomic features is discussed. Read the example for Conduction and fill in the sections for Convection and. The blood supply of the sinus node is from terminal small branches of both the right and left coronary arteries and that to the AV node and His bundle is from similar terminal branches of the septal artery only. Doth the AV node and His bundle contain many conspicuously large nerve trunks. are thought to be instructive for differentiation of the conduction system. The AV node is organized with input system and bypass tracts similar to those of man and the dog. This demonstrates that formation of the heart and the connecting vessels is.
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The AV node and His bundle are relatively small and are displaced anteriorly by the large coronary sinus normally present in the rabbit because of its persisting left superior vena cava. The rabbit's sinus node is a simple and distinct structure located at the junction of the crista terminalis with the sinus intercavarum nearly midway between the two cavae it contains an unusually large percentage of P cells but is not organized about a large central artery.
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Second degree block in which some impulses from SA node only get conducted to the ventricles. First degree block wherein there will be delayed conduction of impulse from the SA node. Although all parts have the ability to generate action potentials and thus heart contractions, the sinuatrial (SA) node is the primary impulse initiator and regulator in a healthy heart. Arteriosclerosis, Thrombosis, and Vascular Biology (ATVB) In complete heart block, there will be delayed conduction or no conduction of impulse to ventricular muscle fibers from the SA node. The parts of the heart conduction system can be divided into those that generate action potentials (nodal tissue) and those that conduct them (conducting fibers).