C) AV node D) ventricle Cardiac Pacemaker Cells: The heart is primarily made up of cardiac myocytes but there exists a small population of cells called cardiac pacemaker cells. These cells display autorhythmicity by continuously spontaneously deplarizing which sets ...
The sinoatrial node (SAN) is the normal pacemaker generating the regular, rhythmic contraction of the mammalian heart. Pacemaker activity of SAN cells is based on the diastolic depolarization, during which SAN cells depolarize spontaneously toward the action potential threshold. However, single SAN ...
-bundle of His, purkinje fibers, AV node-can take over, although at a lower rate, if the normal pacemaker fails (when the SA node is malfunctioning or doesnt get enough oxygen) escape beat -The AV node assumes the Pacemaker activity ectopic focus -when another area of the heart becomes ...
The normal heart rhythm, known as sinus rhythm, originates in specialized cardiac cells, called pacemaker cells, in the sino-atrial (SA) or sinus node and has been defined as a sinus node rate of 60 to 100 beats/minute. Each heart beat or contraction is initiated by generation of an ...
Mechanisms of spontaneous pacing: SA-nodal cells, neonatal cardiomyocytes, and human Stem cell derived cardiomyocytes. 来自 国家科技图书文献中心 喜欢 0 阅读量: 21 作者:M Morad,X Zhang 摘要: The sino-atrial node is the primary site from which the mammalian heart is paced, but the mechanisms ...
房室束 Bundle of his 左/右束支 Left/ right bundle branch 浦肯野纤维 Pukinje fibres 认识窦房结 Sinoatrial (SA) node 相当于是一个总司令,发布命令,位于上腔静脉和右心房的交界处,由交感神经和副交感神经系统控制。 The main pacemaker that initiates each heartbeat 。It is located at the junction...
A Arai,I Kodama,J Toyama - 《American Journal of Physiology》 被引量: 67发表: 1996年 Roles of Cl- channels and Ca2+ mobilization in stretch-induced increase of SA node pacemaker activity Examines the effects of several compounds that block various types of stretch-sensitive ion channels on th...
The sinoatrial (SA) node is a complex structure in which pacemaker cells at the node center activate surrounding atrial tissue, leading to spontaneous beating of the heart tissue. Using multielectrode arrays (MEA), we conducted detailed studies of the rabbit sinoatrial node with spatial resolution ...
Effects of hypoxia on the electrical activity of pacemaker cells of rabbit SA nodedoi:10.1016/0022-2828(89)91564-2O. TripathiElsevier LtdJournal of Molecular & Cellular Cardiology
Concentrations of morphine equivalent to those producing peripheral vasodilation when given intravenously did not affect the SA pacemaker activity in in situ and in isolated SA node preparations of dogs. Larger doses of morphine, 300 μg to 1 mg, directly induced a negative chronotropic response, ...