00:01
This question asks, when the knee moves back and forth during walking, what prevents the surfaces of the leg bones from rubbing against each other? the articular cartilage, the epiphizzies, the synovial fluid or the smooth muscle.
00:14
So here we have to identify that within the knee joint, we are going to find articular surfaces of bone.
00:23
We are going to have, in a joint, usually, we are going to find two bones that are coming into the bone.
00:32
Not contact, not direct contact with each other, but into contact with each other in terms of spatial relationships.
00:41
So these two bones are going to be joined at a joint, not in direct contact, but in contact with respect to motion.
00:50
So the motion of one bone will have an influence on the motion of the other.
00:54
Now, at the very surface of bones, we find what is known as the articular surfaces.
01:05
And the articular surfaces basically cover bone with a layer of smooth articular cartilage.
01:23
And what does this do? well, the articular cartilage is going to prevent bones from contacting one another.
01:33
So they will prevent the direct contact of two bones within a joint...