Here we have an example problem that asks, "Which of the following formed elements is not technically considered to be a complete cell?" And we've got these four potential answer options down below. Option A says erythrocytes, which, recall, are red blood cells. Option B says leukocytes, which, recall, are white blood cells. Option C says platelets, which, recall, are also known as thrombocytes. And then Option D says they are all considered to be cells.
Now, of course, recall from our last lesson video that platelets or thrombocytes are not considered complete cells; instead, they are considered cell fragments. And so because they are considered cell fragments, we can go ahead and indicate that Option C here must be the correct answer to this example problem. And, we can eliminate Option D because it says they are all considered to be cells. But again, these platelets are not considered cells; they're considered cell fragments.
Now you might recall from our previous lesson videos that erythrocytes or red blood cells lack a nucleus, and they also lack several organelles. And because of that, they're not technically considered complete cells because they lack many of those common features that are found in many complete cells. However, despite that fact, erythrocytes, or red blood cells, are still considered cells. And so what this means is that Option A here is not going to be the best option for this problem. And the best option for this problem, again, is going to be answer Option C, the platelets, which are definitely cell fragments, not considered cells. And so, because erythrocytes are still considered cells, we can eliminate answer Option A, and then, of course, leukocytes are considered complete cells, so we can eliminate that option. So again, C here is correct. That concludes this problem, and I'll see you all in our next video.
