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cereus    
n. 仙人掌的一种

仙人掌的一种

Cereus
n 1: genus of much-branched treelike or shrubby cacti with
pronounced ribs and rounded needlelike spines and nocturnal
flowers usually white [synonym: {Cereus}, {genus Cereus}]


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  • Sinoatrial node: definition, location, function | Kenhub
    It is the first component of the cardiac conduction system and is composed of specialized cardiac muscle cells, which are bundled together into a node within the right atrium
  • Sinoatrial node - Wikipedia
    The sinoatrial node (also known as the sinuatrial node, SA node, sinus node or Keith–Flack node) is an oval shaped region of special cardiac muscle in the upper back wall of the right atrium made up of cells known as pacemaker cells
  • Sinoatrial node - healthencyclopedia. org
    As the primary pacemaker of the heart, the SA node generates electrical impulses that initiate the cardiac cycle and determine the heart rate [1] The SA node is composed of specialized pacemaker cells, also known as sinoatrial cells or nodal cells
  • Sinoatrial Node: The Heart’s Natural Pacemaker - Biology Insights
    The cells that constitute the SA node are a type of specialized cardiac muscle cell, often called pacemaker cells These are smaller than typical heart muscle cells and are embedded within connective tissue
  • Anatomy and Function of the Hearts Electrical System
    An electrical stimulus is generated by the sinus node (also called the sinoatrial node, or SA node) This is a small mass of specialized tissue located in the right upper chamber (atria) of the heart The sinus node generates an electrical stimulus regularly, 60 to 100 times per minute under normal conditions The atria are then activated
  • Sinoatrial Node - an overview | ScienceDirect Topics
    The sinoatrial (SA) node (Fig 3 1) is a spindle-shaped structure composed of highly specialized cells located in the right atrial sulcus terminalis, which is lateral to the junction of the superior vena cava (SVC) and the right atrium
  • The Central Brain of the Heart: The Sinoatrial Node∗
    Electrical connectivity via gap junctions between pacemaker and transitional cells mediates the transmission of impulses out of the SA node during each cardiac cycle
  • Cardiac Pacemaker Cells - Cardiac Cycle - TeachMePhysiology
    Cardiac pacemaker cells are mostly found in the sinoatrial node (SAN), which is situated in the upper part of the wall of the right atrium These cells have natural automaticity, meaning they can generate their own action potentials





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