The human body has roughly 700 muscles.
Each one is responsible for a different movement in the body.
However, they all work together to help people walk, talk, gesture, and more.
Muscles make up 50 percent of the body weight of humans, so take a look at why they are so important.
What Are Muscles?
Muscles are tissues in the body that work together to make the body move.
However, there are several different ways in which this is done.
There are three types of muscles – skeletal, smooth, and cardiac.
Skeletal muscle is responsible for movement of arms, legs, and all major bones and joints.
Smooth muscle is responsible for internal organs and the digestive system.
And, cardiac muscle is responsible for the heart, which pumps blood throughout the body.
Skeletal muscle is attached to the bones.
It is made up of small units called muscle fascicles that are connected together by tissue called fascia.
This makes skeletal muscle look like several strands of string all lined up next to each other.
As each muscle fascicles contracts, the fascia tissue makes different areas of the body move by applying force to the bones and joints.
Smooth muscle does not have the same striated structure as skeletal muscle.
Instead, it has spindle-shaped cells that are connected by a nucleus. It contracts automatically and slowly.
Smooth muscle is responsible for the movement of the digestive system and internal organs.
It is also found inside the blood vessels.
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Cardiac muscle serves one purpose – to make the heart contract and pump blood throughout the body.
As a matter of fact, cardiac muscles makes the heart beat about 100,000 times per day.
Cardiac muscles contracts rhythmically and automatically and is essential to life.
The structure of cardiac muscle looks different than both skeletal muscle and smooth muscle.
It is shorter with Y-shaped connections.
Muscles generate force by contracting and pulling.
Their elasticity causes them to elongate and then contract back into place, causing movement in the body.
Muscle fibers take different shapes throughout the body to contract in calculated ways.
Muscles are responsible for producing movement, maintaining posture, stabilizing joints, assisting in blood circulation, and generating heat.
People can’t run forever because muscles don’t have unlimited energy.
This energy is called ATP and it is gained from high-energy phosphates that are stored in the body.
People need to eat to replenish these energy sources, and both carbohydrates and proteins are essential to this function.
The body also needs all sorts of other nutrients to produce energy.
Oftentimes, this energy is referred to as calories.
Muscle Contraction: The Energetics
How Muscles Work by Craig C. Freudenrich, Ph.D.
Bones and Muscles: An Introduction to Human Anatomy