WebThe sinoatrial node acts as the primary pacemaker – controlling the rate at which the heart beats (i.e. pace ‘making’) The SA node triggers roughly 60 – 100 cardiac contractions per minute (normal sinus rhythm) If the SA node fails, a secondary pacemaker (AV node) may maintain cardiac contractions at roughly 40 – 60 bpm http://ib.bioninja.com.au/standard-level/topic-6-human-physiology/62-the-blood-system/heart-beat.html

Electrical Properties · Part One - LITFL

WebAbout the SA Node. On the upper right side of your heart (right atrium) there is a bundle of cells called the SA node (sinoatrial node). This small collection of neurons creates the … WebThe conduction system of the heart. Normal excitation originates in the sinoatrial (SA) node, then propagates through both atria (internodal tracts shown as dashed lines). The atrial depolarization spreads to the atrioventricular (AV) node, passes through the bundle of His (not labeled), and then to the Purkinje fibers which make up the left ... emerald maraboon

Conduction Pathway of the Heart Flashcards Quizlet

Web28 de jun. de 2016 · Overview The conducting system of the heart consists of cardiac muscle cells and conducting fibers (not nervous tissue) that are specialized for initiating impulses and conducting them rapidly... WebThe rhythm of the heart is normally determined by a pacemaker site called the sinoatrial (SA) node located in the posterior wall of the right atrium near the superior vena cava. The SA node comprises specialized cells that undergo spontaneous generation of action potentials at a rate of 100-110 action potentials ("beats") per minute. This intrinsic rhythm … emeraldmarble macbook wallpaper