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Bones and muscles are both organs that make up the musculoskeletal system. Bones are rigid organs that form the skeleton and protect other organs. They produce blood cells, store minerals, and enable mobility. Muscles, on the other hand, are soft tissues made up of fibres that allow for movement. They can be classified as skeletal, smooth, or cardiac muscle tissue. Recent evidence has also identified skeletal muscle as a secretory organ, producing and releasing substances that affect other organs and potentially contributing to the health benefits of exercise.
| Characteristics | Values |
|---|---|
| Number of bones in the human body | Between 206 and 213 |
| Number of muscles in the human body | More than 600 |
| Functions of bones | Provide support for the body, help form the body's shape, protect organs, store minerals and vitamins, create new blood cells |
| Functions of muscles | Help the body move, generate heat in the body, protect organs, maintain posture, regulate blood sugar levels |
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What You'll Learn
Bones give the body its shape
Bones indeed give the body its shape. The adult human body has between 206 and 213 bones. Bones are the body's main form of structural support and hold the body upright. They are strong tissues made of collagen, a protein that forms a flexible framework, and calcium phosphate, a mineral that makes them strong and hard. The leg bones, for example, are very large and strong to help support the weight of the body. The bone that goes from the pelvis to the knee is called the femur, the longest bone in the human body.
The skull protects the brain and forms the shape of the face. The spinal cord, 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 skeletal system, or musculoskeletal system, is the body's support structure and includes bones, muscles, cartilage, and connective tissue like ligaments and tendons. Bones are fastened to other bones by ligaments, long fibrous straps of tissue. Cartilage, a flexible, rubbery substance in our joints, supports bones and protects them where they rub against each other.
The body has more than 600 muscles made of tightly woven, stretchy fibres. They help the body move and control everyday movements, such as walking, running, jumping, and breathing. They also help with communication, such as smiling and talking, and help the body stay physically fit and healthy.
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Bones and muscles protect organs
Bones and muscles are indeed organs, and they work together to protect other organs in the body. The skeletal system, which includes bones, muscles, cartilage, and connective tissue, is the body's support structure. It gives the body its shape and holds the organs in place. Bones are the body's main form of structural support, and they work with muscles to allow for movement.
Bones protect organs by acting as a suit of armour for the body. The skull, for example, protects the brain and forms the shape of the face. The spinal cord is protected by the backbone or spinal column, which also helps us walk, move, twist, and bend. The ribs form a cage that shelters the heart and lungs, and the pelvis helps protect the bladder, part of the intestines, and the reproductive organs in women.
The musculoskeletal system, which includes bones, muscles, and joints, gives the body its structure and support. Bones give the body its shape and help to hold it upright. They are strong tissues made of collagen and calcium phosphate, which makes them hard and strong. Muscles, on the other hand, are made of tightly woven, stretchy fibres. They help control movements and some body systems, such as digestion.
Together, bones and muscles work to protect the body's organs from injury. Bones provide the main structural support, while muscles help to hold the skeleton together and control movements that could otherwise cause damage. For example, skeletal muscles (which are attached to bones by tendons) work in pairs, with one muscle contracting and the corresponding muscle lengthening to allow for a full range of motion. This helps to prevent injury by ensuring that bones do not move in the wrong direction or at the wrong angle.
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Bones store minerals
Bones are a key part of the skeletal system, which is the body's support structure. An adult human body contains between 206 and 213 bones, which support the body's weight and give it shape.
The skeletal system also includes connective tissue, such as cartilage, ligaments, and tendons, which help to keep the body supported and safe during movement. Bones and muscles work together to help the body move. For example, skeletal muscles, which are attached to bones by tendons, facilitate everyday movements by contracting and pulling bones across joints.
Bones also play a critical role in storing and releasing minerals. Bones store growth factors and minerals such as calcium, phosphorus, and vitamin D. Bones release factors into the blood that are necessary for the normal functioning of soft organs such as the kidney. The human body needs calcium to build and maintain bones and to ensure all cells in the body work properly. The amounts of vitamins and minerals such as vitamin D and calcium directly affect how much calcium is stored in the bones. Bone is made of protein, collagen, and minerals, with collagen providing a framework for the incorporation of minerals, mainly calcium phosphate. The mineral makes the bone hard and strong, while the collagen provides flexibility.
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Muscles help the body move
Bones and muscles are indeed organs that are part of the skeletal system, also known as the musculoskeletal system. The skeletal system is the body's support structure, giving the body its shape and holding its organs in place. Bones provide structural support, while muscles, tendons, ligaments, and cartilage enable movement.
There are over 600 muscles in the human body, and they help us do everything from walking, running, and jumping to breathing, digesting food, and even giving birth. Muscles are made of tightly woven, stretchy fibres that contract to generate movement. This movement can be voluntary, such as walking or jumping, or involuntary, such as the beating of the heart or the movement of food through the digestive system.
Voluntary movements are those that we consciously control, such as moving our limbs or chewing our food. These movements are controlled by the brain and nervous system, which send signals to the muscles to contract and relax, resulting in movement. Skeletal muscles, which are attached to bones, are an example of voluntary muscles. They work in pairs, with one muscle contracting while the corresponding muscle lengthens. For example, when the bicep contracts, the tricep lengthens.
Involuntary movements, on the other hand, occur automatically without conscious thought. Examples include the beating of the heart and the movement of the chest and ribs during breathing. Smooth muscles, which are found in various internal structures such as the digestive tract, uterus, and blood vessels, are responsible for involuntary movements. These muscles do not have striations and cannot be actively controlled. Instead, they are activated by neuronal signalling or hormones, resulting in changes in calcium levels that lead to muscle contraction.
Both types of muscles work together to help the body move and function properly, demonstrating the essential role of muscles in human movement and overall health.
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Bones and muscles make up the musculoskeletal system
Bones and muscles, along with joints, cartilage, tendons, and ligaments, make up the musculoskeletal system. This system provides the human 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. There are three types of muscle tissue: cardiac muscle, smooth muscle, and skeletal muscle. Cardiac muscle forms the muscular layer of the heart. Smooth muscle comprises the walls of blood vessels and hollow organs like the stomach and intestines. Skeletal muscle, which attaches to bones through tendons, provides voluntary movement. Skeletal muscles work in pairs, with one muscle contracting and the other lengthening. They help the body move and perform everyday tasks like chewing food and smiling.
The skeletal system's main component is bone. Bones articulate with each other and form joints, providing the body with a mobile skeleton. The adult human skeleton is made up of between 206 and 213 bones. Bones give the body its shape and support, and they also protect internal organs. The skull protects the brain, the ribs shield the heart and lungs, and the vertebrae in the spine protect the spinal cord. Bones also store important minerals like calcium and vitamin D.
The musculoskeletal system is susceptible to various conditions and injuries, such as arthritis, osteoporosis, and back pain. These issues can be addressed by doctors, physiotherapists, and rheumatologists.
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Frequently asked questions
Bones and muscles are not organs but part of the musculoskeletal system, which is an organ system.
The musculoskeletal system is made up of the skeletal system (bones, joints, cartilage, and connective tissue) and the muscular system (specialized contractile tissue called muscle tissue).
The musculoskeletal system provides the body with stability, mobility, and support. It also helps protect the organs, store minerals, and generate new blood cells.
Bones are connected to muscles through tendons, which are made of dense connective tissue. When muscles contract, they transmit mechanical force to the tendons, pulling the bones and causing movement.
Bones form a protective structure around vital organs. For example, the skull protects the brain, the ribs protect the heart and lungs, and the pelvis helps protect the bladder and intestines.
