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The word muscle comes from the Latin musculus, which means both muscle and little mouse. Muscles are a type of body tissue that contracts when stimulated to produce movement. There are over 600 muscles in the human body, which help us do everything from moving our limbs to breathing. In addition to biological muscle, the word muscle can also refer to power or authority, as in the phrase we have the muscle to get the job done.
| Characteristics | Values |
|---|---|
| Definition | A type of body tissue that contracts when stimulated to produce motion |
| Number of muscles in the body | Over 600 |
| Types | Skeletal, smooth, and cardiac |
| Function | Help people and animals breathe, walk, blink, eat, etc. |
| Injuries | Strains, spasms, skin discolouration, paralysis, etc. |
| First Aid | RICE method (Rest, Ice, Compression, Elevation) |
| Diagnostic Procedures | Electromyogram (EMG), Blood tests, Magnetic resonance imaging (MRI), etc. |
| Synonyms | Strength, power, force, etc. |
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What You'll Learn
- Skeletal muscles are attached to bones and move the skeleton
- Smooth muscles are responsible for involuntary movements and are present in the walls of hollow organs
- Cardiac muscles are striated and contain functional units called sarcomeres
- Muscle strains are the most common muscle injury, caused by overuse
- Muscles can refer to power or authority, as in the phrase we have the muscle to get the job done
Skeletal muscles are attached to bones and move the skeleton
The word element "myo-" or "my-" means muscle, and it is derived from the Greek word "mys" which means "mouse," reflecting the shape of certain muscles. Now, let's discuss skeletal muscles and their relationship with the skeleton in more detail:
Skeletal muscles are a fundamental part of the human body, and their primary function is to facilitate movement. As the name suggests, these muscles are attached to bones, and their contraction and relaxation enable the body to move in a variety of ways. This system of muscles and bones working in harmony is known as the musculoskeletal system.
One of the defining characteristics of skeletal muscles is their attachment to bones. They are connected to the skeleton via tough, fibrous tissues called tendons. Tendons provide a strong and flexible link between muscle and bone, allowing for the transmission of force generated by the muscle contraction to the bones, resulting in movement. This connection is what enables us to perform a wide range of actions, from subtle finger movements to powerful athletic feats.
The arrangement of skeletal muscles in the body is designed for optimal movement and stability. Most often, muscles occur in pairs, with one muscle responsible for moving a joint in one direction, and its opposing muscle returning the joint to its original position. This system of antagonistic muscle pairs ensures smooth and controlled movements. For example, when you bend your elbow, the biceps muscle contracts to flex the joint, while the triceps muscle relaxes. To straighten the elbow, the triceps contract, and the biceps relax.
The structure of skeletal muscle also contributes to their function. Each muscle fiber is composed of myofibrils, which contain contractile proteins. These proteins slide past each other during contraction, resulting in the shortening of the muscle fiber and subsequent movement at the associated joint. Additionally, skeletal muscles have sensory capabilities, providing feedback to the central nervous system about body position and movement, further refining our coordination and balance.
Beyond movement, skeletal muscles have other important roles in the body. They provide structural support and help maintain posture. They also play a role in protecting our internal organs and, to a certain extent, help regulate body temperature. Additionally, skeletal muscles are involved in the storage and metabolism of glucose, making them important for energy homeostasis.
In summary, skeletal muscles are a vital component of the musculoskeletal system, facilitating movement, providing structural support, and contributing to various physiological processes. Their attachment to bones via tendons enables the transmission of force, resulting in the complex and coordinated movements that characterize human physicality. Understanding the function and importance of skeletal muscles provides insight into the remarkable capabilities of the human body and the intricate interplay between its various systems.
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Smooth muscles are responsible for involuntary movements and are present in the walls of hollow organs
The human body is made up of more than 600 muscles that help us move, breathe, and perform other vital functions. Muscles are a type of body tissue composed of thousands of small fibres woven together that contract when stimulated to produce movement. There are three types of muscle tissue: smooth, skeletal, and cardiac.
Smooth muscles are involuntary muscles that are found in the walls of hollow organs such as the stomach, intestines, bladder, and uterus. They are also present in the walls of blood vessels and lymph vessels, where they are known as vascular smooth muscles. Smooth muscles play a crucial role in maintaining blood pressure and blood flow by regulating the lumenal diameter of small arteries and arterioles. They are also involved in the digestive tract, where they contract in a rhythmic peristaltic fashion to move food through the digestive system.
Additionally, smooth muscles are found in the respiratory, urinary, and reproductive systems. For example, in the eyes, smooth muscles change the size of the iris and pupil and alter the shape of the lens. In the skin, they cause goosebumps in response to cold temperatures or fear. Smooth muscles also have a role in the disease process throughout the body. For instance, bronchodilators are used to relax airway smooth muscles in asthmatic patients, and medications like metoclopramide stimulate gastric emptying by increasing smooth muscle signalling.
Smooth muscles differ from skeletal muscles in structure, function, and regulation of contraction. They have greater elastic properties and can stretch while maintaining contractility, which is important in organs like the intestines and urinary bladder. Smooth muscles are controlled by the nervous system, which uses hormones, neurotransmitters, and receptors to regulate their contraction and relaxation.
In summary, smooth muscles are responsible for involuntary movements and are present in the walls of hollow organs, playing a vital role in maintaining bodily functions and responding to various stimuli.
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Cardiac muscles are striated and contain functional units called sarcomeres
The human body has more than 600 muscles that help us move, breathe, and perform other vital functions. Muscles are a type of body tissue that contracts when stimulated to produce motion. There are three major categories of muscles: smooth muscle, skeletal muscle, and cardiac muscle.
Cardiac muscle, also called myocardium, is striated and is made up of sarcomeres that allow for contractility. Cardiac muscle cells, or cardiomyocytes, are branched and contain many mitochondria. Each cardiomyocyte contains a single, centrally located nucleus surrounded by a cell membrane known as the sarcolemma. The sarcolemma contains voltage-gated calcium channels, which skeletal muscle does not possess.
Sarcomeres are the functional units of muscle fibres and are composed of two protein filaments: actin (thin filaments) and myosin (thick filaments). These filaments interact to form the basis of the sliding filament theory, which explains muscular contraction. When viewed under a microscope, sarcomeres are visible along muscle fibres, giving a striated appearance to the tissue.
Cardiac muscle is under involuntary control, meaning it contracts without conscious control. This is in contrast to skeletal muscle, which is typically under voluntary control. Cardiac muscle is responsible for the contractility of the heart and, therefore, the pumping action that supplies blood to the entire body.
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Muscle strains are the most common muscle injury, caused by overuse
Muscle strains, or pulled muscles, are the most common type of muscle injury. They occur when the muscle fibres are stretched beyond their limit and tear apart, either partially or completely. This can happen when a muscle is overused or overfatigued and is not given enough time to repair, or when sudden, explosive movements are performed, such as sprinting, twisting, or jumping.
Muscles are a type of body tissue that contracts when stimulated to produce movement. There are over 600 muscles in the human body, which help us to move, breathe, and perform everyday functions. They are composed of thousands of small fibres woven together, which stretch and press together to create movement. There are three types of muscle tissue: smooth, cardiac, and skeletal. Skeletal muscles are the most commonly thought of as they move our arms and legs and support our weight. Smooth muscle and cardiac muscle contract involuntarily.
Muscle strains can be graded according to their severity, from Grade 1, which involves minimal structural damage, to Grade 3, where the muscle tears into two pieces or shears away from the tendon. Symptoms of a muscle strain include sudden pain, swelling, bruising, loss of strength, and reduced range of motion. The pain may worsen when contracting the muscle and can feel like a kick or blow.
To prevent muscle strains, it is important to stretch and warm up before physical activity, as this increases blood flow to the muscles and makes them more flexible and less likely to tear. Strength training can also help to build muscle resilience. If a muscle strain occurs, it can often be treated at home using the RICE method: Rest, Ice, Compression, and Elevation. However, severe tears may require medical care or even surgery.
In summary, muscle strains are the most common muscle injury, caused by overuse or overfatigue. They can be prevented through proper stretching and warming up, and treated with rest and ice. However, severe strains may require medical attention and a prolonged recovery process.
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Muscles can refer to power or authority, as in the phrase we have the muscle to get the job done
The word "muscle" typically refers to the body tissue that contracts when stimulated to produce movement. There are over 600 muscles in the human body, which help us do everything from breathing and blinking to running marathons.
However, the word "muscle" can also be used as a metaphor to refer to power or authority. For example, in the phrase "we have the muscle to get the job done," the word "muscle" conveys a sense of strength and ability to take action. This usage of the word likely stems from the physical strength and power associated with muscular body tissue.
In addition to referring to power or authority, the word "muscle" can also refer to a hired thug or enforcer. For instance, a person might "muscle their way through a crowd" by using their physical strength to push people out of the way. As a verb, "muscle" can mean to use force or coerce someone, as in "he muscled me out of my place in line."
The word "muscular," an adjective derived from "muscle," can also be used metaphorically to describe something that is powerful or robust. For example, one might describe a well-organized and efficient business as having a "muscular management structure."
Thus, while the word "muscle" primarily refers to body tissue that enables movement, its usage has expanded to include figurative references to power, strength, and authority.
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Frequently asked questions
The word part "my" means muscle.
The word part "rhabd" means striated.
The root word of muscle is the Latin "musculus", which means both "muscle" and "little mouse".
The word part "lysis" means dissolution.
An example of a medical term that uses the word part for muscle is "myolysis", which means the dissolution of muscle.
