00:01
In this problem, we're asked to evaluate some statements about phagocytosis, which is the process by which cells engulf microbes and debris and destroy it.
00:11
And we're going to look at all the steps of this process and then evaluate all of our statements.
00:17
So first step is phagocytic cells need to be attracted to the area by some type of chemical attractin.
00:23
This process is called chemotaxis.
00:26
Next, they need to recognize the invader, the microbe, and attach to it.
00:32
Third, they need to engulf or create pseudopods and do endocytosis on the bacterium or the debris.
00:41
This produces an enclosed vesicle that's called a phagosome, which is going to mature, it's going to add acid and become a phagolysosome as it merges with lysosomes.
00:51
That lysosomal merger is going to allow digestion and destruction of the materials inside of it.
00:58
And then the debris, the destroyed materials, are going to be removed from the cell by exocytocin.
01:03
Now let's evaluate our statements here.
01:07
We've got a couple of correct statements about chemotaxis and about recognition...