Facts about Muscles

An Overview

Muscles are soft tissues, which are mainly involved in producing force and motion and are primarily responsible for locomotion in both animals and humans. The human muscular system includes more than 600 muscles, which make up to 30 to 40 per cent of the total body weight.

There are different types of muscles:

Based on the muscle location, muscles are classified into:

  • Skeletal or striated muscles
  • Cardiac muscles
  • Smooth muscles

Based on the muscle action, muscles are further classified into:

  • Voluntary muscles
  • Involuntary muscles

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Here are a few interesting facts about muscles.

Interesting Facts about Muscles


Muscles are the soft tissue or the flesh that is present on the bone. These muscles work in pairs to bring movement in a bone. Based on the contractibility, elasticity, excitability and extensibility, muscles are further classified into different types.


Red and white muscles are two different types of skeletal muscles, which are involved in the various functions in the body.

Also Read: The Muscular System


The smooth muscles and cardiac muscles are called involuntary muscles, as their actions are controlled by the autonomic nervous system in the body.


The non-striated muscles are also called involuntary muscles, which are involved in stimulating the contractility of the blood vessels, digestive system, reproductive systems and other organ systems in our body.


The skeletal muscles are called voluntary muscles, as actions are mainly under the control of the somatosensory nervous system.


The masseter muscle, which is situated at the back of the jaw is the strongest muscle in the human body. This is a thick muscle in the cheek and it functions by opening and closing the jaw while chewing food.

Also Read: Human Anatomy


During muscle contraction, the thin filaments slide over the thick filaments and simultaneously the signal is sent to the central nervous system through the motor neuron to initiate the activation within muscle fibres.


Muscle fatigue is the muscle disorder, which occurs due to repeated activation of the muscles, leading to an accumulation of lactic acid. This results in the decreased functioning of the muscles.


The gluteus maximus, which is located in the buttocks is called the heaviest and the largest muscle in the body. These muscles function by supporting the trunk, maintaining proper posture, providing the shape of the buttocks and is the main muscle we all use while climbing up the stairs.

Refer more: Locomotion


Along with the various functions, there are some severe muscle disorders, which are caused due to several factors including the age, nutritional deficiency, changes in the hormonal levels, lack of physical activities and other lifestyle changes. Muscular dystrophy, myasthenia gravis, tetanus and tetany are a few examples of muscle disorders in humans.

This article concludes an introduction to muscles, along with their amazing facts. To know more about muscles, their types, functions, important questions and other related topics, keep visiting our website at BYJU’S Biology.

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