What is the Muscular System?
The muscular system is an organ system, involved majorly in the movement of the body. There are about 700 muscles that are connected to the bones of the skeletal system, which roughly half make up the human’s body weight. Every muscle is a different organ made of skeletal muscle tissue, blood vessels, nerves, and tendons. Muscle tissues are found in the heart, blood vessels, and digestive system.
There are three kinds of muscle tissues namely cardiac, visceral and skeletal.
This muscle is present only in Heart and responsible for supplying blood all over the body. It is also an involuntary muscle since it cannot be controlled. When brain signals adapt the rate of contraction, cardiac muscle stimulates by itself to contract. The natural pace of the heart is made up of cardiac muscle tissue and stimulates other cardiac muscle cells to shrink.
The cardiac muscle cells are straight which reveals that they seem to have dark and light stripes when seen under a microscope. The protein fibres arrangement within the cells is responsible for these dark and light stripes.
These muscles are found in the organs like intestines, blood vessels, and stomach. It is the weakest of all muscle tissues and makes organs contract to move substances through the organ. It is said to be involuntary muscle because it cannot be directly controlled by the conscious mind but controlled by the unconscious part of the brain. It is also known as a smooth muscle since it has a very smooth, uniform appearance when viewed under the microscope.
It is the only voluntary muscle tissue that can be controlled in conscious condition. Every physical action that a human does (e.g. walking, writing) needs skeletal muscle. The skeletal muscle is responsible for moving the body parts that are connected to the bone.
Skeletal muscles from many ancestor cells lump themselves together to produce a straight, long fibre. These skeletal muscles are strong just like cardiac muscles. The name is derived from the fact that these are connected to the skeleton in at least one region.
Also Read: Sliding Filament Theory
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