Solution for QUESTION 3 What would happen if the AV node failed to delay transmission of signals from the SA node? The atria and ventricles would contract at…

While the SA node is considered the pacemaker of the heart, the AV node is also capable of generating spontaneous action potentials, allowing it to serve as a “backup system” in case of SA node failure. If the SA node fails, how would you anticipate the baseline heart rate to change, and why is this the case?

Scenario 2-One very unhealthy-looking human goes into atrial fibrillation while working out in the Vegan gym. This is when the SA node is not generating coordinated electrical impulses. Instead, impulses are flowing randomly over the atrial walls eventually making their way to the AV node. The AV node then generates normal electrical impulses. The result of this appears to be …

Solution for Which of the following sequences for the conducting system is correct? Select one: a. AV node, SA node, bundle branches, AV bundle, Purkinje…

Solution for QUESTION 2 What would happen if the electrical signals radiated out from the AV node rather than being routed to the apex of the heart? The atria…

Solution for When these valves open, blood goes from the atria to the ventricles. AV node AV valves SA

From the SA node, the electrical impulse flows directly to the Atrioventricular node (AV node) with the guidance of intercalated discs and gap junctions. The AV node is located in the back section of the interatrial septum near the coronary sinus and tricuspid valve.

Because of a reduced blood supply to the AV node, the delay in theconduction of action potentials from the SA node to the AV node isincreased slightly. All other areas of the conducting system of the heartare functioning normally. Predict how this affects the normal rhythm ofthe heart.

Solution Summary: The author explains that the cardiac impulse travels from the sinoatrial (SA) node into the atrial syncytium and the atria begin to contract simultaneously.

A 28-year-old athlete is noted to have a baseline heart rate of 55bpm, which his trainer attributes to excellent parasympathetic (vagal) tone. This parasympathetic effect normally increases Ach release at the SA and AV nodes. Ach release into AV node leads to which of the following effects of its fibers? a. increased action potential amplitude b. increased conduction velocity c. …