Logan Steele
Bones and muscles are both essential components of the human body, working together to enable movement and provide structure. Bones, which are strong yet lightweight, form the skeletal framework of the body, offering support and protection to internal organs. Meanwhile, muscles facilitate movement by contracting and relaxing, working in tandem with bones to allow for a wide range of physical activities. The musculoskeletal system, comprising bones, muscles, joints, tendons, and ligaments, is integral to human mobility and overall health. Injuries or illnesses affecting this system can lead to conditions like arthritis, osteoporosis, and back pain, highlighting the delicate interplay between bones and muscles in maintaining bodily functions.
| Characteristics | Values |
|---|---|
| Bones and muscles as part of the body | Bones, muscles, and joints form the musculoskeletal system. |
| Function | Bones give the body shape and support, while muscles enable movement. |
| Organs they protect | Bones protect the brain, heart, liver, lungs, spinal cord, bladder, intestines, and reproductive organs. |
| Minerals they store | Bones store calcium, calcium phosphate, and vitamin D. |
| Number | The adult human skeleton is made up of 206 bones. The human body has over 600 skeletal muscles. |
| Ageing | Bones lose calcium and other minerals, become more brittle, and break more easily. Muscles become less toned and less able to contract, and may become rigid. |
| Exercise | Exercise helps maintain the strength of bones and muscles. |
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What You'll Learn
Bones and muscles work together to enable movement
Bones provide support for our bodies and help form our shape. Although they are very light, bones are strong enough to support our entire weight. They also protect our organs from injury. For example, the skull protects the brain, the ribs shield the heart and lungs, and the pelvis helps protect the bladder, part of the intestines, and in women, the reproductive organs. Bones are made up of a framework of protein and minerals, such as calcium and vitamin D, which make them hard and strong.
Muscles help control our movements and some body systems, such as digestion. There are more than 600 skeletal muscles in the human body, and they are attached to bones by cord-like tendons. Skeletal muscles are striated, meaning they are made up of fibres that have horizontal stripes when viewed under a microscope. These muscles help hold the skeleton together, give the body shape, and help with everyday movements. They can contract and relax quickly and powerfully, but they tire easily.
When we want to move, our brain sends a message to the muscles, which then contract and relax to pull on the bones. Muscles work in pairs of flexors and extensors. For example, if you want to lift your arm, the bicep muscle in the front of your upper arm contracts, and the tricep muscle at the back of your upper arm relaxes. When you lower your arm, the bicep relaxes and the tricep contracts.
In summary, bones and muscles work together to enable movement by providing support and protection for the body, and by contracting and relaxing to pull on the bones and create movement.
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Bones are stronger than muscles
Bones and muscles, along with joints, cartilage, tendons, and ligaments, are part of the human body's musculoskeletal system. Bones provide support for our bodies and help form our shape. Although they are very light, they are strong enough to support our entire weight. Bones also protect our organs from injury. For example, the skull protects the brain, the ribs form a cage that protects the heart and lungs, and the pelvis helps protect the bladder, part of the intestines, and, in women, the reproductive organs. Bones also store important minerals such as calcium and vitamin D.
Muscles, on the other hand, help control our movements and some body systems, such as digestion. They help the heart beat, the chest rise and fall during breathing, and blood vessels regulate the pressure and flow of blood. They also help us communicate by allowing us to smile and talk. When we exercise, they enable us to stay physically fit and healthy.
While both bones and muscles are essential components of the human body, bones can be considered stronger than muscles in the sense that they provide structural support and protect vital organs. Bones are also more resistant to injury and can withstand greater forces than muscles. For example, in the case of a fall or impact, bones are more likely to withstand the force and protect the underlying tissues and organs from damage.
Additionally, bones can benefit from muscle activity. The harder the muscles tug on the bones, the more the body strengthens those bones. Strength training, for instance, can play a role in slowing bone loss and even building bone. This can help offset age-related declines in bone mass and minimize the risk of fractures due to osteoporosis.
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Bones protect internal organs
Bones, muscles, and joints form the musculoskeletal system, which enables us to perform everyday physical activities. Bones provide support for our bodies, help form our shape, and protect our internal organs from injury.
The skull, for instance, protects the brain and forms the shape of the face. The spinal cord, which acts as a pathway for messages between the brain and the body, is protected by the backbone or spinal column. The ribs form a cage that shelters the heart and lungs, and the pelvis helps protect the bladder, part of the intestines, and in women, the reproductive organs.
The musculoskeletal system also includes connective tissue that helps to keep us safe and stable while moving or remaining still. Bones are connected by joints, which allow us to move in many ways. Some joints open and close like a hinge (such as knees and elbows), while others allow for more complicated movement. For example, a shoulder or hip joint allows for backward, forward, sideways, and rotating movement.
Muscles help to control our movements and some body systems, such as digestion. They are made of tightly woven, stretchy fibres and are attached to bones by cord-like tendons. There are more than 600 skeletal muscles in the human body, which help with everyday movements (known as voluntary muscles because we can control their movement). They can contract (shorten or tighten) quickly and powerfully, but they tire easily.
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Bones and muscles are both strengthened by exercise
Bones and muscles work together to form the musculoskeletal system, which enables us to do everyday physical activities. Bones provide support and protection for our bodies, while muscles help control our movements. Bones and muscles are both strengthened by exercise, and this strengthening is essential for maintaining bone and muscle health throughout life.
Bones Strengthened by Exercise
Bones are strengthened by weight-bearing exercises, which are activities done on the feet that work the bones and muscles against gravity. When the feet and legs carry the body's weight, more stress is placed on the bones, making them work harder and adapt by building more bone and becoming denser. Examples of weight-bearing exercises include walking, jogging, jumping rope, and weightlifting. These exercises increase bone density and provide more bone-strengthening benefits, but they may not be suitable for people with medical conditions or thinning bones.
Muscles Strengthened by Exercise
Muscular strength develops from performing exercises such as weightlifting, bodyweight exercises, and resistance band exercises. Progressive muscle resistance training is a type of muscle-strengthening exercise that involves using weights or resistance bands to gradually increase the workload on the muscles. This type of training leads to hypertrophy, or the enlargement of cells, and neural adaptations that enhance nerve-muscle interaction, resulting in increased muscle strength. Examples of muscle-strengthening exercises include squats, push-ups, and jumping jacks.
Benefits of Exercise for Bone and Muscle Health
Exercise helps to prevent or slow bone loss, maintain muscle mass, and decrease the risk of falling, which is especially beneficial as we age. Additionally, regular physical activity improves balance and coordination, preventing falls and the potential for broken bones. Exercise also provides benefits beyond bone and muscle health, improving overall physical fitness and health.
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Bones and muscles are both affected by ageing
Bones and muscles are both integral parts of the human musculoskeletal system. Bones provide the body with shape and support, while muscles facilitate movement and help the body perform various functions. Despite their differences, both bones and muscles are affected by the ageing process.
Bones are the body's main form of structural support. They are very light but strong enough to support the entire body's weight. Bones also protect the organs from injury. For instance, the skull protects the brain, the ribs shield the heart and lungs, and the vertebrae in the spine keep the spinal cord safe. Bones also store important minerals like calcium and vitamin D. However, with age, bones become more susceptible to breaking. Bones lose calcium and other minerals, making them more brittle and easier to break. The spinal column shortens, leading to a decrease in overall height. Osteoporosis, a condition that results in a loss of bone density and thinning of bone tissue, is also associated with ageing.
Muscles help the body perform a variety of functions, from controlling movements like smiling and talking to regulating the heart rate and blood flow. They work in pairs of flexors and extensors to move body parts by contracting and then relaxing. However, with age, muscles undergo changes that affect their functionality. Muscle fibres shrink, and muscle tissue is replaced more slowly. Lost muscle tissue may be replaced with tough fibrous tissue, causing the hands to look thin and bony. Muscles become less toned and less able to contract due to changes in the muscle tissue and the nervous system. They may even become rigid and lose tone, despite regular exercise. The speed and amount of these muscle changes seem to be influenced by genes, with changes often beginning in the 20s for men and 40s for women.
Ageing affects not just bones and muscles in isolation but also their interaction. Together with connective tissue and joints, they enable the body to move. However, ageing leads to a loss of bone density and muscle mass, resulting in reduced strength and flexibility. Changes in the muscles and bones also affect posture and gait, leading to a weakened and slowed movement.
While ageing undoubtedly impacts bones and muscles, exercise can prevent and even reverse many of these changes. A moderate exercise program can help maintain strength, balance, and flexibility, keeping bones strong and delaying muscle degeneration.
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