- [Voiceover] Like every other system,
there's problems of disease and disorders
that go with the skeletal.
Probably one of the most common is going to be a sprain.
Now sprains are stretched or torn ligaments.
So it's not really the bone being damaged
but it's what holds the bones together.
If you end up stretching out a ligament too far
or even partially tearing it,
it will not be able to perform the original function.
If you completely tear it then all bets are off.
Bursitis and tendinitis,
both of these are going to be inflammations.
Bursitis is when a bursa becomes inflamed.
Now a bursa is going to be this fluid-filled sac
found in your joints.
Its purpose to help to cushion and can help protect
some of the components of the joints.
So bursitis inflammation.
Tendinitis also inflammation,
but is now when a tendon has become inflamed.
Arthritis.
There are many different types of arthritis.
It's not just one single,
here is arthritis.
But in general all the various types of arthritis
deal with inflammation of joints,
whether it's minor inflammation,
major inflammation something is causing a problem.
Some examples are Osteoarthritis,
Rheumatoid arthritis.
Now Rheumatoid's kind of interesting
because in Rheumatoid arthritis
it's your body's own cells attacking your body's joints.
Your own immune cells are attacking the joints
causing inflammation and damage in Rheumatoid arthritis.
Now we have Osteoporosis.
Osteoporosis is characterized by excessive bone loss.
You can see the figure on the right is figure A.
That is healthy bone.
The figure on the left that is figure B,
that is Osteoporotic bone.
You can see how in the Osteoporotic bone
you have all these little opens,
or channels or holes in there.
It's making the bone that much weaker.
That means the Osteoclast cell is working
faster than the Osteoblast cell.
So Osteoporosis the calcium's being pulled out
of the bone making the bone weaker.
Now what's the most common age group or gender to have this?
Unfortunately the most common grouping
is going to be post-menopausal females.
Because of all the hormone changes going on,
those hormone changes upset the balance of the bones
causing the bones to have excessive bone mass loss.
So losing mass that losing strength
and the bones can get progressively weaker.