SA节点和AV节点之间的差异

关键区别 - SA节点vsAVnode

这心is an important organ for living organisms which functions in the循环系统as the pumping device. This ensures the transportation of different substances in the circulatory medium; blood, which includes氧，营养素，废物产品等。人心脏由四个腔室组成。二心房（上议院）和两个心室钱伯斯(低)。心跳的速率和the two circulatory mechanisms;pulmonary circulation and systemic circulationare regulated by nodes present in the heart. The中心（SA）节点和Atrio ventricular（AV）节点是心脏中存在的两个主要节点。这SA node generates cardiac action potential due to spontaneous depolarization by the pacemaker cells whereas, the AV node involves in the reception of the action potential from the SA node and pass it to the AV bundle。这是关键区别在SA节点和AV节点之间。

内容

1.概述和关键差异
2.什么是SA节点
3.What is AV node
4。SA节点和AV节点之间的相似性
5。并排比较 - SA节点vs AV节点以表格形式
6。概括

什么是SA节点？

这中心节点存在于中庭的后部区域，靠近开口的上侧壁上腔静脉被称为鼻窦Vernarum。它由一组称为起搏器细胞的细胞组成。起搏器细胞参与引起自发的去极化，从而引发电脉冲的产生。动作潜力。SA节点的大小变化，并具有香蕉形结构。SA节点的典型尺寸为10-30毫米，宽度为5-8毫米，深度为1-2毫米。

这起搏器SA节点的单元格存在于connective tissue包括不同成分，例如血管，nerves,fat和胶原纤维。在SA节点中，起搏器细胞被另一组称为偏阳细胞的细胞包围。偏阳细胞由与SA节点细胞和心庭细胞具有相似性的结构组成。偏阳细胞的主要功能是借助结缔组织隔离SA节点。

这SA node cells are smaller than atrial cells and they consist of fewermitochondria.It receives blood from the sino atrial nodal artery. The number of arteries highly differs according to different individuals. The main role of the SA node is to generate an action potential which causes the contraction of the atriums. This is regulated by the神经系统。这交感神经系统slows down the rate of induction of action potential, and para sympathetic nervous system speeds up the rate respectively.

什么是AV节点？

这AV node or the房室节点is a section of the electrical conduction system located in the heart. The AV node is found at the lower posterior portion of the interatrial septum closer to the coroner sinus. Precisely, the AV node lies in the middle of a triangular area known as the Koch’s triangle, which is comprised of the tricuspid valve, the coronary sinus, and the interatrial septum membrane. Electrical impulses from the atria to ventricles are generated via the AV node.

这cardiac artery known as the atrioventricular nodal branch supplies blood to the AV node. This artery is mainly originated from the right coronary artery but, the remaining part of the artery originates from the circumflex artery. Bone morphogenetic protein (BMP) is a multifunctional molecule where cell signals are produced for cardiac morphogenesis and differentiation. These BMPs are essential molecules which develop the AV node, and the development is accomplished through a receptor called Activin receptor-like kinase 3 (Alk3). Diseases such as AV conduction disease or Ebstein’s anomaly are caused due to abnormalities took place in BMPs or Alk3 receptor.

AV节点接收到右心房的两个输入。通过CRISTA末端接收后输入，并通过原子间隔接收前输入。AV节点，作为心脏传导系统的一部分，可以协调monocytes。这AV node is activated by the sino atrial node (SA node) after it is excited. A wave of excitation is spread through the atria for the activation of SA node. After the AV node is activated, a 0.12s delay of impulses is taken place. This cardiac delay is important since the ejection of blood through the atria into the ventricles before its contraction is ensured.

What is the Similarity Between SA node and AV node?

• SA节点和AV节点参与了心跳的设置及其在血液循环过程中的调节。

SA节点和AV节点有什么区别？

SA node vs AV node
SA node is the heart’s natural pacemaker which stimulates the heart muscle and regulates its contractions.	AV node is specialized cardiac muscle fibers in the lower interatrial septum that receives impulses from the sinoatrial node and transmits them to the bundle of His.
地点
SA节点位于靠近心脏上腔静脉的开口的上侧壁中。	AV节点存在于右心房的后隔壁，更靠近心脏的冠状窦开口。
功能
SA节点在自动节奏纤维的帮助下，由于速度制造商细胞自发去极化而产生心脏作用潜力，从而为心率设定了基本的速度，这是通过两个心房进行的。	AV节点涉及从SA节点接收动作电位，并将其传递到AV束。
规定
这action of the SA node is regulated by autonomic nervous system.	AV节点的作用由SA节点调节。
角色
SA node acts as a pacemaker.	AV节点充当paceSetter。

摘要 - SA节点vsAVnode

这SA node and AV node are two main nodes present in the human heart. The SA node generates cardiac action potential due to spontaneous depolarization by the pace maker cells. The AV node involves the reception of the action potential from the SA node and passes it to the AV bundle. In common terms, the SA node act as the Pace maker and the AV node act as the Pace setter. The autonomous nervous system regulates the SA node. The AV node is regulated by the SA node itself. This is the difference between SA node and AV node.

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Reference:

1.《英国百科全书》的编辑。“心。”2017年1月10日，英国百科全书，英国百科全书。Available here
2.Anatomy of the Human Heart.Available here

Image Courtesy:

1.’心脏无心脏的心脏系统，没有心脏（CC BY-SA 3.0）via下议院维基梅迪亚
2.’2018 Conduction System of Heart’By OpenStax College – Anatomy & Physiology,连接网站。2013年6月19日。(CC BY 3.0)via下议院维基梅迪亚