Victor Forge
The human body has over 600 muscles that are constantly working, even when we are sitting still. They are a vital part of the musculoskeletal system and are responsible for many functions, including movement, heartbeat, breathing, digestion, and stabilising our bodies. Muscles also protect our bones and organs by absorbing shock and reducing friction in the joints. They help the body perform various tasks, from holding the skeleton together to running a marathon.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | More than 600 |
| Muscle types | Skeletal, cardiac, smooth |
| Skeletal muscle composition | Bones, tendons, muscle fibres |
| Skeletal muscle functions | Movement, holding the skeleton together, giving the body shape |
| Smooth muscle functions | Involuntary movements, digestion, maintaining blood pressure, childbirth |
| Cardiac muscle functions | Heartbeat, blood flow |
| Muscle protection | Absorbing shock, reducing joint friction |
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What You'll Learn
Muscles protect the heart
The human body is made up of more than 600 muscles that help us move, breathe, swallow, and stay alive. These muscles are pieces of soft tissue that support our bones and organs. While bones provide structural support and protection to our organs, muscles also play a role in keeping our vital organs safe.
The heart is a vital organ that pumps blood throughout the body. It is located in the left chest, with the left lung being slightly smaller to make room for it. The rib cage, which forms a protective cage around the heart and lungs, is made up of bones that are supported and moved by the muscles. The heart itself is composed of muscle and tissue, with cardiac muscle making up the middle layers.
Cardiac muscle, also known as myocardium, is an involuntary type of muscle that contracts and relaxes to pump blood through the cardiovascular system. It is only found in the heart and does not exist anywhere else in the body. The walls of the heart's chambers are composed almost entirely of muscle fibres.
While the heart is protected by the rib cage and supported by surrounding muscles, it is also an organ that benefits from the presence of muscles throughout the body. Strengthening these muscles can improve heart health and reduce the risk of heart disease. Any type of movement or exercise that makes the heart work harder, such as brisk walking or cycling, can contribute to better heart health. Additionally, targeted exercises to strengthen muscles can help stave off harmful belly fat accumulation, which can be hard on the heart.
In summary, muscles play a crucial role in protecting the heart. They support the rib cage that shields the heart and enable the heart to function effectively by pumping blood throughout the body. Maintaining strong muscles throughout the body can also contribute to overall heart health.
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They protect the digestive system
The muscular system plays a crucial role in protecting and facilitating the function of the digestive system. Muscles enable movement within the body, including during digestion, by pushing food through the digestive tract. The digestive system relies on smooth muscles, which are involuntary muscles lining the inside of some organs, including the gastrointestinal (GI) tract. These smooth muscles contract and relax as food passes through the body, a process known as peristalsis, which pushes food through the oesophagus into the stomach.
Peristalsis is a wave-like motion that occurs in the hollow organs of the GI tract, where the muscle behind the food contracts and squeezes it forward, while the muscle in front relaxes to allow the food to move. This process is controlled by the enteric nervous system (ENS), which comprises nerves within the walls of the GI tract. When food stretches these walls, the ENS releases substances that speed up or delay the movement of food and the production of digestive juices.
In addition to the smooth muscles of the GI tract, the digestive system has three muscular sphincters that control the movement of food and other substances. The cardiac sphincter regulates the movement of food between the oesophagus and stomach, the pyloric sphincter between the stomach and small intestine, and the anal sphincter controls defecation. These sphincters are circular smooth muscles that involuntarily regulate the movement of contents at the junction of two parts or an opening.
The muscular system, including the smooth muscles of the digestive system, is essential for protecting and maintaining the body's overall health and functionality.
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Muscles protect bones
The human body is an intricate system where bones, joints, and muscles work together to enable movement and perform various functions. Muscles play a crucial role in protecting bones and ensuring their proper functioning.
There are over 600 muscles in the human body, and they are pieces of soft tissue that help with various tasks, from moving the body to breathing, digesting food, and even speaking. Skeletal muscles, which are attached to bones, make up 30% to 40% of our total body mass. These muscles are under our voluntary control, and they contract and relax to create movement. For example, when you bend your elbow, the bicep muscle in the front of your upper arm contracts, and then it relaxes as the tricep muscle at the back of the upper arm contracts to straighten the elbow.
Furthermore, muscles help prevent injuries and protect bones by ensuring proper form and weight distribution during physical activities. For example, when lifting heavy objects, keeping your back straight and bending your knees transfers the weight to the stronger leg muscles, protecting the muscles in your back.
In summary, muscles play a vital role in protecting bones by enabling movement, absorbing shock, providing stability, and ensuring the overall structural integrity of the human body.
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They protect the brain
The brain is a vital organ that controls thought, memory, emotion, touch, motor skills, vision, respiration, and every process that regulates the human body. It is one of the two main parts of the central nervous system, which also includes the spinal cord. The brain and spinal cord are both protected by bone: the brain by the skull, and the spinal cord by the vertebrae.
The brain is in constant electrochemical communication with the muscles, sending signals back and forth. Skeletal muscle, which allows humans to move, is an endocrine tissue that releases signalling molecules to other parts of the body. When muscles contract, create new cells, or perform other metabolic activities, they release myokines into the bloodstream. Myokines are protein molecules that transmit messages from the skeletal muscle to other tissues, including the brain.
There is evidence that certain myokines have sex-differentiated neuroprotective properties. For example, the myokine irisin is influenced by estrogen levels, and postmenopausal women are more susceptible to neurological diseases. This suggests that irisin may play a role in protecting neurons against age-related decline. Additionally, people with sarcopenia, or age-related muscle atrophy, are more likely to experience cognitive decline.
Therefore, maintaining muscle health is crucial for brain health. Exercise improves memory, processing speed, and executive function, especially in older adults.
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Muscles protect the eyes
Muscles are pieces of soft tissue that help the body perform a variety of functions, from moving to breathing and even communicating. There are three types of muscles in the human body: skeletal, cardiac, and smooth muscle.
The human body has more than 600 muscles, including six eye muscles that control the direction of the eyes and contribute to vision. The eye muscles are a key part of how our vision works. They help make subtle changes to the shape of the eye, moving the focus point so that it lands correctly on the retina. The dilator muscle opens the pupil, while the sphincter muscle closes it, regulating the amount of light entering the eye. The ciliary muscle around the lens changes the shape of the lens, allowing for suitable focus.
Eye muscles are essential for daily activities such as reading and following directions. Protecting the eyes from injuries is crucial, and this can be done through regular eye exams and by wearing eye protection such as goggles or impact-resistant glasses. Eye movement issues can indicate serious conditions, so sudden changes in eye movement control or vision require immediate medical attention.
Maintaining eye muscle health involves getting regular eye exams and wearing eye protection to prevent injuries. A well-balanced diet with fruits and vegetables rich in beta-carotene and other carotenoids may also help reduce the risk of cataracts and slow macular degeneration. Additionally, wearing sunglasses that block harmful ultraviolet (UV) rays can protect the eyes from prolonged exposure to UV light, which can increase the risk of cataracts and macular degeneration.
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Frequently asked questions
Muscles are pieces of soft tissue that help your body move, breathe, swallow, and stay alive. There are more than 600 muscles in the human body, and they work together with bones to help you move. They also protect your bones and organs by absorbing shock and reducing friction in the joints.
There are three types of muscles in the body: skeletal, cardiac, and smooth muscle. Skeletal muscles are voluntary muscles that you control consciously, while smooth and cardiac muscles are involuntary and controlled by the autonomic nervous system.
Skeletal muscles are the most common type of muscle in your body, comprising 30-40% of your total body mass. Examples include shoulder muscles, hamstring muscles, and abdominal muscles. They are attached to your bones and controlled by your central nervous system.
Smooth muscles are found in the walls of the stomach, intestines, and blood vessels. They help with digestion and maintaining blood pressure. Cardiac muscles are found in the heart and also help with blood flow.
