00:01
Hello everyone, let's discuss the question.
00:03
In this question we have to talk about the three type of muscles found in our body.
00:07
So first we will talk about skeletal muscles.
00:13
Now skeletal muscles, they are also known as voluntary muscles as we can control them with our will.
00:22
Now these muscles, they are attached to the bones and they are composed of long, multinucleated fibers which have striations on them.
00:43
So striations are present on the fibers.
00:48
Now if we talk about the contraction on skeletal muscles, then the contraction, it is initiated by nerve impulse which then releases calcium ions from sarcoplasmic reticulum that is sr which is the endoplasmic reticulum of muscles and from sarcoplasmic reticulum when the calcium ions is released, this leads to the sliding of actin and myosin filaments.
01:26
So actin and myosin, both these type of filaments are involved in the movement of skeletal muscles.
01:39
Now this movement of or sliding of actin and myosin filament, it leads to the shortening of sarcomere which ultimately leads to muscle contraction.
01:59
So this is the whole procedure of contraction of skeletal muscles.
02:05
Now we will talk about cardiac muscles.
02:12
Cardiac muscles are also involuntary in nature as we do not control them and cardiac muscles are found in our heart and they are involuntary.
02:28
Now when we talk about the fibers of cardiac muscle, they are short, branched, having single nucleus as well as striations are also found in the fibers of cardiac muscles just like they had in skeletal muscles.
02:55
Now when we talk about the contraction of cardiac muscle, it involves again the sliding of actin and myosin filament which ultimately leads to shortening of sarcomere and thus the contraction of the muscle takes place...