- [Voiceover] This slide is cardiac muscle. Now, cardiac, hopefully you're thinking heart. This is the muscle that makes up your heart. The current magnification is 1000X total magnification. Now, in this slide we're looking for what is unique with cardiac muscle. So, with this time, you don't really need to zoom in because this view print shows you everything you need to see. One thing you'll notice, we have those striations again going across the slide. So, cardiac muscle has striations. Well, that's a similarity to your skeletal muscle. A difference, though is if you see right here how it's a darker band and then right here is another darker band. These are called intercalated disks. Now, these intercalated disks are a unique feature of cardiac muscle. Another thing you can notice is right here. You go from one band here and then it branches into two. Your cardiac muscle, the cells are branching. So, we have striations, we have intercalated disks, we have branching cells. Now, as far as nuclei go, you see one right here. Cardiac muscle is typically uninucleate. Now, maybe binucleate sometimes, but a lot of times it's uninucleates. Well, where's it found? Well, hopefully you get the idea from cardiac. Refers to heart. Is found in the heart. As far as control. Can you say, "Heart, speed up." or, "Heart, slow down."? Not really. That means this is involuntary control. So, the features of cardiac muscle. We have striations. We have the intercalated disks. We have the branching cells. We have typically uninucleates. We have location of the heart and then we have involuntary control. That is your cardiac muscle.