Match the following parts of the muscle with the correct descr...

Question

Match the following parts of the muscle with the correct description:

a) Sarcomere. ______: voluntary muscles (i.e. triceps) that consist of muscle fascicles.

b) Myofibrils. ______: repeating units of sarcomeres.

c) Fascicles. ______: multinucleated cells that consist of a bundle of myofibrils.

d) Sarcoplasmic Reticulum. ______: membrane-bound structure found within muscle cells.

e) Skeletal Muscle. ______: complex of thin actin and thick myosin filaments.

f) Muscle Fiber. ______: a bundle of skeletal muscle fibers.

Accepted Answer

Alright. So, here we have a practice problem that will help you guys better memorize the skeletal muscle anatomy and so this practice problem wants us to match the following parts of the muscle that we see over here, with the correct description that we see over here. And so this first is description that we see over here. And so this first description that we have here says voluntary muscles, for example, our triceps that consist of muscle fascicles. And so recall from our previous lesson videos that these voluntary muscles are going to be our skeletal muscle and so we can go ahead and label this blank here with option E and then cross it off from our list. Now, the next one says, repeating units of sarcomeres and of course, from our previous lesson video, we know that the repeating units of sarcomeres are going to be the myofibrils and so the myofibrils are these repeating units of sarcomere. So we can put b here for myofibrils and cross it off. Now the next blank here says, multinucleated cells that consist of a bundle of myofibrils. And so, if myofibrils are these repeating units of sarcomeres, well, a bunch of myofibrils are gonna be found inside of these long multinucleated cells that are muscle fibers. And so muscle fibers, f here, is, going to be the multinucleated cell. Now, the membrane bound structure found within muscle cells is of course going to be the sarcoplasmic reticulum which is really surrounding these myofibrils inside of the muscle fiber. And so the sarcoplasmic reticulum is d, so we can put that here for this membrane structure and again, the sarcoplasmic reticulum is going to be important when we talk about the muscle contraction because it's associated with releasing calcium but again, we'll talk more about this idea later in our course when we talk about muscle contraction. So, the next blank here says, complex of thin actin and thick myosin filaments and of course, this is going to be the sarcomere. So, we can go ahead and label that as A and in our next lesson video, we'll talk a lot more details about the structure of the sarcomere and then, of course, last but not least, what we have is a bundle of skeletal muscle fibers and of course, this is going to be the fascicles, the muscle fascicles. So, we can go ahead and place that in as C. And so, this is the answer to this practice problem and if you fill this out a few times using the image up above, you should be good with, understanding the skeletal muscle anatomy that you should be familiar with and so that concludes this practice problem and I'll see you guys in our next video.

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