00:01
So, the mechanism of muscle contraction was proposed by the sliding filament theory.
00:25
And according to this sliding filament theory, the muscles are composed of actin and myosin filaments.
00:40
And these actin and myosin filaments, they overlap each other.
00:46
And that leads to the shortening of muscle fiber in length.
01:05
So let's try to understand this.
01:10
So what happens is, this is approximately suppose say the length of the muscle fiber.
01:18
And here we have the actin filaments.
01:39
And these are the myosin filaments.
01:43
Okay.
01:45
So the myosin filaments are a little thicker than the actin filaments.
01:51
So this is the actin and these are the myosin filaments.
02:02
Okay.
02:03
And this middle part is known as the m line.
02:12
And the two ends are known as z disc.
02:16
This is one z disc and this is another z disc.
02:21
So as a result of contraction, the length of the muscle fiber shortens.
02:31
Okay...