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?

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 the same time The ventricles would start squeezing from the top to the bottom The AV node and the SA node would be unable to communicate Neuronal regulation of heart rate would be impaired None of the above are correct

a. The action potential created by the pacemaker cells of the SA node directly stimulates the contractile cells of both the atria and ventricles. b. The rate of spontaneous depolarization of nodal cells is the fastest in the SA node. c. Pacemaker cells in the SA node form a pathway between the SA and AV nodes. d.

Your grandfather was told that his SA node (pacemaker) had stopped functioning. Explain how his heart is still beating at a rate of 40-50 times per minute. Are the atria still being stimulated to contract, and what area of the heart is stimulating them?

The sinoatrial node is a smaller body of cells present in the right atrium and is composed of pacemaker cells that are principal in generating action potential, a type of electrical impulse which is extremely important in employing contraction across the chambers of the heart.

a. The action potential created by the pacemaker cells of the SA node directly stimulates the contractile cells of both the atria and ventricles. b. The rate of spontaneous depolarization of nodal cells is the fastest in the SA node. c. Pacemaker cells in the SA node form a pathway between the SA and AV nodes. d.

Section 1: Create a flow chart image showing the map of the electrical activity of the heart (begin with the SA node) Include each step the electrical activity travels as it goes through the heart. Section 2: Create a flow chart image showing the map of how blood flows through the heart Include each step starting in the right atria

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.

An arrhythmia originating in pacemakers that shift back and forth between the SA node and an ectopic pacemaker in the atria or AV junction is called a(n): A. Multifocal atrial tachycardia B. Wandering atrial pacemaker C. Paroxysmal supraventricular tachycardia (PSVT) D.

You are testing a compound as cardioactive drug. You know the compound is an agonist of acetylcholine (ACh) at the relevant ACh receptor (AChR) on sinoatrial (SA) node cells. Briefly describe how the action of the drug likely would affect …