Logan Steele
Bones, muscles, and joints make up the musculoskeletal system, which enables us to perform everyday physical activities. There are more than 600 skeletal muscles in the human body, comprising 30% to 40% of our total body mass. These muscles are attached to bones by tendons and help us move, generate heat, protect organs, and maintain posture. They consist of flexible muscle fibres that contract and relax, allowing us to perform a wide range of movements. Smooth muscles, such as the heart's cardiac muscle, are involuntary and controlled by the body's needs. In contrast, skeletal muscles are voluntary, allowing conscious control of movement.
| Characteristics | Values |
|---|---|
| Definition | Bones, muscles and joints make up the musculoskeletal system |
| Number of bones | 33 vertebrae in the spine |
| Bone composition | Collagen (a protein that forms a flexible framework) and calcium phosphate (a mineral that makes them strong and hard) |
| Bone function | Give people shape, hold the body upright, protect internal organs, and help with movement |
| Number of skeletal muscles | More than 600 |
| Muscle function | Help the body move, generate heat, protect organs, maintain posture, and help with breathing, chewing, and digestion |
| Types of muscle | Skeletal (voluntary), cardiac (involuntary), and smooth (involuntary) |
| Muscle composition | Contractile fibres and non-contractile dense fibrous connective tissue (fascia) |
| Muscle fibres | Actin and myosin filaments arranged in a striated pattern |
| Muscle layers | Epimysium (outermost), perimysium (middle), and endomysium (innermost) |
| Muscle strength | Depends on the force exerted, the largest cross-sectional area, and the number of muscle fibres |
| Muscle energy consumption | 54.4 kJ/kg (13.0 kcal/kg) per day at rest |
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What You'll Learn
- Bones, muscles and joints make up the musculoskeletal system
- There are more than 600 skeletal muscles in the human body
- Tendons are made of strong fibrous connective tissue and attach muscles to bones
- Bones are strong tissues made of collagen and calcium phosphate
- The spine is the central support of your body, helping you walk, move, twist and bend
Bones, muscles and joints make up the musculoskeletal system
Bones, muscles, and joints make up the musculoskeletal system, which provides the body with movement, stability, shape, and support. The musculoskeletal system is subdivided into two broad systems: the muscular system and the skeletal system. The muscular system includes all types of muscles in the body, while the skeletal system's main component is the bone.
The muscular system contains tendons that attach muscles to bones. There are three types of muscle tissue: cardiac muscle, smooth muscle, and skeletal muscle. Cardiac muscle forms the heart and is not part of the musculoskeletal system. Smooth muscle comprises the walls of blood vessels and hollow organs. Skeletal muscle, which is the only type under voluntary control, attaches to bones and allows for movement.
The skeletal system provides the body with a hard-core, yet mobile, skeleton. Bones articulate with each other and form the joints, which connect bones and allow them to move. There are three different types of joints: fibrous joints, cartilaginous joints, and synovial joints. Fibrous joints do not move, whereas synovial joints, the most common type, allow for a wide range of movement. Cartilaginous joints provide more stability but less movement.
The musculoskeletal system also contains cartilage, a flexible connective tissue that cushions the ends of bones. Ligaments are tough bands of tissue that join bones to other bones to strengthen joints. Bones give the body shape and hold the body upright. They also protect internal organs and help with movement.
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There are more than 600 skeletal muscles in the human body
The human body has more than 600 skeletal muscles, which make up around 30% to 40% of body weight in healthy young adults. Skeletal muscles are attached to bones by tendons, which are made of strong fibrous connective tissue. They are the most common type of muscle in the body and are also known as voluntary muscles, as they can be controlled by the brain.
Skeletal muscles are predominantly involved in movement. They contract and relax, allowing the body to perform a wide range of movements and functions. They also help generate heat in the body, protect organs, and maintain posture. These muscles work in pairs, with one contracting and the other lengthening. For example, when you bend your elbow, the biceps muscle in the front of your upper arm contracts, and then relaxes as the triceps muscle at the back of the upper arm contracts to straighten the elbow.
Skeletal muscles can be found all over the body and are involved in a variety of functions. For instance, the erector spinae supports the spine and enables movements such as bending, arching, and twisting. The diaphragm is another skeletal muscle that separates the torso from the abdomen and is involved in breathing. The masseter is a skeletal muscle found in the jaw, used for closing the mouth and chewing food.
The skeletal muscles are made up of thousands of muscle fibres that are bundled together, forming a striped pattern. These fibres contract, allowing the muscles to move bones and perform various movements. Skeletal muscle uses more calories than other organs, consuming 54.4 kJ/kg (13.0 kcal/kg) per day at rest.
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Tendons are made of strong fibrous connective tissue and attach muscles to bones
Bones, muscles, and joints make up the musculoskeletal system, which enables us to perform everyday physical activities. There are three types of muscles, each with different functions that help the body move and function well. These include skeletal muscle, which is a voluntary muscle that we can consciously control. Skeletal muscles are attached to bones by tendons.
The tendon type reflects its associated muscle's morphology and function. Tendon tissue is present throughout an entire muscle's length, not just at the tips. The musculotendinous junction is the point where the muscle pierces the tendon, and the osteotendinous junction is where the tendon inserts into the bone. Tendons are mostly made of collagen, one of the most abundant proteins in the body. Collagen fibres are flexible, strong, and resistant to damage. The bundling of collagen fibres reinforces the tendon and makes it even stronger.
Tendons are also surrounded by other connective tissues, like the endotenon, which helps the bundles of collagen fibres glide against each other inside the tendon. The epitenon is connected to the peritenonium externally and the endotenon internally. The endotenon is a thin membrane of loose connective tissue that covers and organises individual tendon fibres into larger bundles. This membrane separates different collagen bundles, allowing neurovascular penetration within the tendon.
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Bones are strong tissues made of collagen and calcium phosphate
Bones, muscles, and joints form the musculoskeletal system, which enables us to perform everyday physical activities. Bones give us shape, hold our bodies upright, and protect our internal organs. They are made of living tissue that is constantly changing and regenerating, a process known as remodelling. Bone cells replace old or damaged bone and build new healthy bone tissue.
The inorganic component of bone tissue is generally known as HAp, or hydroxyapatite, a crystalline complex of calcium and phosphate. In addition to calcium and phosphate, bone minerals contain significant amounts of carbonate, magnesium, sodium, and fluorine. These minerals play a crucial role in the structure and properties of bones.
There are two types of bone tissue: the dense, hard outer layer, called compact or cortical bone, and the inner, less dense, lattice-like bone, called cancellous, trabecular, or spongy bone. This inner bone is surrounded by bone marrow, which produces new blood cells. The hardness and rigidity of bone are due to the presence of mineral salt in the osteoid matrix, which contains collagen and non-collagenous proteins.
Osteoblasts are cells responsible for bone matrix synthesis and its subsequent mineralization, forming new bone tissue. Osteoclasts, on the other hand, are large multinucleated cells that break down and reabsorb bone tissue. Osteocytes, long-lived cells inside bones, direct the activities of osteoblasts and osteoclasts. Together, these cells ensure the constant renewal and strength of bone tissue.
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The spine is the central support of your body, helping you walk, move, twist and bend
Bones, muscles, and joints make up the musculoskeletal system, which enables us to perform everyday physical activities. Bones give our bodies shape and hold our bodies upright. They also protect our internal organs, such as the heart and liver, from injury.
The spine, also known as the vertebral column, is a central part of the musculoskeletal system. It is a long, flexible column of 33 bones called vertebrae, separated by discs. The spine begins at the base of the skull and ends at the tailbone, which is part of the pelvis. It has three distinct segments: the cervical spine (neck), the thoracic spine (middle back), and the lumbar spine (lower back).
The spine is the central support of the body, helping us walk, move, twist, and bend. It carries nerve signals from the brain to the rest of the body and sensory input from the body back to the brain. The cervical spine, for example, allows us to turn, tilt, and nod our heads. The thoracic spine helps stabilize the rib cage, which in turn stabilizes the spine and protects the heart and lungs. The lumbar spine enables us to bend at the lower back.
The spine's flexibility is due to the joints and intervertebral discs between the vertebrae. Facet joints, for instance, have cartilage that allows vertebrae to slide against each other, enabling us to twist and turn. The discs provide cushioning and flexibility, acting as shock absorbers.
Exercises that strengthen the core muscles supporting the spine can help prevent back injuries and pain. However, certain exercises can exert excessive pressure on the spine, increasing the risk of injury. It is important to be mindful of how we perform exercises to optimize fitness and minimize injury risk.
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Frequently asked questions
Bones and muscles, along with joints, form the musculoskeletal system and enable us to do everyday physical activities.
Bones give the body shape and hold it upright. They also protect internal organs, like the heart and liver, from injury. Bones are strong tissues made of collagen and calcium phosphate. Bone cells are constantly changing through a process called remodelling, where old or damaged bone is replaced with new, healthy bone tissue.
Muscles help the body move. There are more than 600 skeletal muscles in the human body, which is the most common type of muscle. They are voluntary muscles, meaning you can control how and when they work. Skeletal muscles also help generate heat in the body, protect organs and maintain posture.
Muscles pull on the joints to allow us to move. They are attached to bones by tendons, which are made of strong fibrous connective tissue. Tendons are part of the muscle and attach to the bones to give skeletal movement.
There are three types of muscle: skeletal, cardiac, and smooth. Skeletal muscles are voluntary muscles that you can control. They are attached to bones by tendons and make up 30-40% of your total body mass. Cardiac muscles form the heart and are not part of the musculoskeletal system. They contract and relax rhythmically without a person's awareness. Smooth muscles are also controlled by the brain but not voluntarily.
