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What does the sinoatrial node do when body temperature is increased?
Known as the "pacemaker of the heart," the sinoatrial node would most likely speed up if the body temperature were to rise.
What first causes the sinoatrial node to begin in a fetus' heart?
The sinoatrial node is a part of the electrical system of the heart. The development of the sinoatrial node is from the sinus horn myocardium in fetal development.
The node that directly controls contraction of the atria is?
Sinoatrial node
What node triggers and impulse?
The sinoatrial node triggers an impulse
Is AV NODE known as pacemaker?
No, it is the SAN (sinoatrial node)
Where does the cardiac action potential originate?
In a normally functioning heart, the SA (sinoatrial) node is the pacemaker of the heart, but if it is nonfunctional then the AV (atrioventricular) node would take over. If it isn't working either then the Bundle of His can trigger contractions, and if it isn't working the Perkinje fibers can trigger contractions. Each progressive one has a slower intrinsic heart rate.
The sinoatrial node is the heart's?
... pacemaker.
What is the peacemaker of the myocardium?
sinoatrial node
What cardiac structure generates the action potentials that spread throughout the heart generating the cardiac contraction and the heartbeats?
The sinoatrial (SA) node, located in the right atrium, is the main pacemaker of the heart. It generates electrical impulses that spread through the atria, causing them to contract. These impulses then travel to the atrioventricular (AV) node and then the bundle of His, leading to ventricular contraction and the heartbeat.
A heartbeat begins with an impulse from the?
In the Sinoatrial Node
Is sinoatrial node called a pacemaker?
yes
What pacemaker of the heart initiates depolarization under normal conditions?
The primary pacemaker of the mammalian heart is the sino-atrial node. If the SA node fails, the atrioventricular node (AV node) takes over pacemaking.
