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Bones and muscles work together to give our bodies shape and allow us to move. Bones provide structure and support, while muscles facilitate movement by contracting and relaxing. In addition to their role in facilitating movement, muscles also play a crucial role in protecting bones and joints by absorbing mechanical impacts. This protective function is particularly evident during activities that involve high-impact forces, such as jumping or contact sports. The skeletal muscles, with their unique viscosity characteristics, act as shock absorbers, dissipating the force of impact and reducing the stress on the bones and joints. This protective mechanism is essential for preventing injuries and maintaining the structural integrity of the skeletal system.
| Characteristics | Values |
|---|---|
| Muscle function | Absorb mechanical shock, protect joints and bones |
| Muscle movement | Contraction and relaxation |
| Muscle pairs | Flexors and extensors |
| Muscle types | Skeletal, striated |
| Muscle attachment | Cord-like tendons |
| Muscle benefits | Strength, endurance, balance, coordination |
| Muscle exercise | Weight-bearing, strength training, resistance |
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What You'll Learn
Muscles absorb mechanical shock to protect bones
Muscles are essential for protecting bones and joints by absorbing mechanical shocks. This function is in addition to the primary role of skeletal muscle, which is to convert chemical energy into mechanical energy to generate movement and force. The ability of muscles to absorb shock is believed to have been a crucial factor in biological evolution, allowing species to move from the ocean to land.
The viscoelastic characteristics of contracted skeletal muscles are thought to protect bones from impact. For example, the knees of downhill skiers receive repeated impacts of hundreds of kilograms, yet their menisci remain undamaged due to the viscosity of their contracted skeletal muscles. Similarly, martial arts experts can break bricks with their bare hands without self-infliction of harm because of the ability of their contracted hand muscles to dissipate the impact.
The role of muscles in shock absorption is particularly evident in physical activities such as running, jumping, and sports like soccer and basketball. During the landing phase of running or jumping, activated skeletal muscles are subjected to stretch, allowing them to quickly and efficiently absorb the impact and protect the bones and joints from damage. This absorption of kinetic energy is achieved through the unlocking of strongly bound heads to a non-stereospecific state and the recruitment of detached heads to non-stereospecific binding to actin.
The neck muscles provide another example of how muscles absorb mechanical shock to protect bones. Without these muscles, the impact on the cervical vertebral bones during activities like heading a soccer ball would be significantly greater, potentially causing damage. Thus, muscles play a crucial role in absorbing mechanical shocks and protecting the bones and joints of the body.
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Muscles can pull on bones but can't push them back
Bones and muscles work together to give our bodies shape and allow for movement. Bones provide the structure and support for our bodies, while muscles, through their contraction and relaxation, facilitate movement by pulling on bones.
When we decide to move, the motor cortex sends an electrical signal through the spinal cord and peripheral nerves to the muscles, causing them to contract. This contraction of muscles pulls on the bones, bending the limbs at the joints. However, muscles cannot push bones back to their original position. Instead, they work in pairs of flexors and extensors. After the flexor contracts to bend a limb, it relaxes, and the extensor contracts to extend or straighten the limb at the same joint. For example, the biceps muscle is a flexor, and the triceps muscle is an extensor for the elbow joint. When you bend your elbow, the biceps contract, and then the triceps contract to straighten it.
The skeletal muscles are attached to the bones by cord-like tendons. They are called striated muscles because they exhibit horizontal stripes when viewed under a microscope. These muscles are often arranged in pairs that pull bones in opposite directions. They not only enable movement but also help hold the skeleton together and give the body its shape.
Additionally, muscles play a crucial role in protecting bones and joints by absorbing mechanical impacts. For instance, the neck muscles absorb impacts to protect the cervical vertebral bones. Similarly, the unique viscosity characteristics of contracted skeletal muscles protect the menisci of downhill skiers from impacts of hundreds of kilograms during slalom skiing.
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Exercise builds bone strength
Bones are made up of living tissue and get stronger when they are used. Exercise is one of the pillars of bone care and fall prevention. Bones are fastened to other bones by ligaments and supported and protected by cartilage, a flexible, rubbery substance in our joints. The skeletal muscle is attached to the bone by cord-like tendons.
Muscles move body parts by contracting and then relaxing. They work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint. Then, when the movement is completed, the flexor relaxes and the extensor contracts to extend or straighten the limb at the same joint. For example, the biceps muscle, in the front of the upper arm, is a flexor, and the triceps, at the back of the upper arm, is an extensor. When you bend your elbow, the biceps contract. Then the biceps relaxes and the triceps contracts to straighten the elbow.
The best type of muscle-strengthening exercise for your bones is progressive muscle resistance training. It involves using weights or resistance bands to build up the work for your muscles to do over time. You do this by gradually increasing the weight you lift, in a slow and controlled way. As you train, you’ll find the movements get easier as your muscles get stronger. The movements you do are called repetitions or reps for short. For example, each time you pull a band or lift a weight is one rep. You should only be able to do 8 to 12 repetitions before your muscles are too tired to do another one with good technique.
There are four groups of muscle-strengthening exercises that can help with bone strength: hinge, push, pull, and squat. Rowing and gardening are also examples of muscle-strengthening exercises. According to the U.S. Department of Health and Human Services, adults of all ages should aim to get at least 150 minutes (2.5 hours) a week of moderate-intensity exercise or at least 75 minutes a week of vigorous-intensity exercise.
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Resistance exercises put stress on bones and build bone mass
Bones and muscles work together to protect our bodies. Bones give our bodies shape and support and protect our organs and systems. The skull, for example, protects the brain and forms the shape of the face. The spinal cord is protected by the backbone, and the ribs form a cage that shelters the heart and lungs. Bones are made up of a framework of collagen and calcium phosphate, which makes them hard and strong.
Muscles, on the other hand, move body parts by contracting and then relaxing. They work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint, and then the extensor contracts to straighten the limb. Muscles can pull on the joints and bones, allowing us to move. They also help with everyday tasks like chewing food and moving it through the digestive system.
Research has shown that strength training can play a role in slowing bone loss and building bone mass. This is because activities that put stress on bones can stimulate bone-forming cells. The tugging and pushing on bones that occur during strength training can lead to stronger, denser bones. Resistance exercises, in particular, have been shown to be beneficial for the preservation of bone and muscle mass.
To improve bone strength, it is important to increase the work that muscles do over time. Progressive muscle resistance training is a great way to do this. It involves using weights or resistance bands to gradually increase the work for the muscles. As the muscles get stronger, they will be able to pull harder on the bones, leading to stronger bones.
Overall, resistance exercises that put stress on bones can help to build bone mass and improve bone strength, making them an important part of maintaining a healthy body.
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Inactivity causes bone loss
Muscle and bone health are closely linked. Bones give our bodies shape, support, and protection for our organs and systems. Skeletal muscles are attached by cord-like tendons to bones and help hold the skeleton together. The role of muscles is to convert chemical energy into mechanical energy, and they also absorb mechanical impacts to protect the joints and bones.
Osteoporosis, a disease that causes bone weakening and increases the risk of fractures, can be managed with physical activity. Physical therapists can help patients find ways to move safely and maintain their balance. For older people with weakened bones, medications that preserve or build bone can be a good option.
In addition to exercise, good nutrition is essential for bone health. Calcium and vitamin D directly affect how much calcium is stored in the bones. Hormonal supplementation can also help improve or maintain bone mass, especially in middle-aged women and men due to the bone-bolstering effects of estrogen.
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Frequently asked questions
Yes, muscles protect bones by absorbing mechanical impacts. For example, leg muscles help to absorb the impact of jumping from a height of 2-3m. Similarly, neck muscles absorb impacts to the head, reducing the force on the cervical vertebral bones.
The viscoelastic properties of contracted skeletal muscles help to absorb impacts. The viscosity characteristics of contracted muscles are especially important in impact absorption.
Muscles help to hold the skeleton together and give the body its shape. They also work to move body parts by contracting and relaxing, allowing us to move.
