Explain why cardiac muscle cells and some smooth muscle cells will continue to contract even when their nerve supply has been removed

Video transcript

Hey, everyone. Let's take a look at this question together, cardiac muscle cells can generate action potentials spontaneously without external nervous input. This is due to which of the following specialized cells is it answer choice. A the bundle of his answer choice. B the per Kinji fibers. Answer choice C the pacemaker cells or answer choice D the atrioventricular or a V node cells. Let's work this problem out together to try to figure out which of the following an choices is the correct name of the specialized cells that allows cardiac muscle cells to generate action potential spontaneously without external nervous input. So in order to solve this question, we have to recall what each of the following answer choices is responsible for to determine which of the following is that specialized cell that allows the cardiac muscle cell to generate action potentials spontaneously without that external nervous input. And we know that these specialized cells which can generate action potentials spontaneously are the pacemaker cells. Since those pacemaker cells which are located in the sinoatrial or S A node are responsible for initiating the elect impulses that set the pace for the entire heartbeat. So the pacemaker cells are the cardiac muscle cells which can generate the action potential spontaneously without external nervous input. So answer choice C pacemaker cells is the correct answer. And all other answer choices are incorrect. Since the bundle of his Perini fibers and atrioventricular node cells are responsible for the conduction of electrical signals within the heart but do not have the same spontaneity as the pacemaker cells. So answer choice C is the only correct answer choice. I hope you found this video to be helpful. Thank you and goodbye.