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The human body has more than 600 muscles that help us move, breathe, and stay alive. Muscles are pieces of soft tissue that work with bones, tendons, and ligaments to support our weight and move our bodies. They also protect our internal organs. For example, the diaphragm, a dome-shaped muscle located below the lungs, helps us breathe. When it contracts, it pushes downward, causing the chest cavity to expand, and the lungs to fill with air. Muscles in the torso also protect the internal organs at the front, sides, and back of the body.
| Characteristics | Values |
|---|---|
| Number of muscles in the body | More than 600 |
| Muscle tissue types | 3 (skeletal, cardiac, smooth) |
| Skeletal muscle composition of body mass | 30-40% |
| Muscle functions | Movement, stability, posture, circulation, digestion, heat production, protection |
| Organs protected by muscles | Brain, heart, lungs, bones, bladder, intestines, reproductive organs |
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What You'll Learn
Muscles protect internal organs from shock and friction
The human body is an intricate system, with muscles and bones working together to support and protect internal organs. Muscles play a crucial role in safeguarding these organs from shock and friction, ensuring their delicate structures remain intact and functional.
There are over 600 muscles in the human body, and they serve a wide range of functions, from enabling movement to supporting vital organs. For example, skeletal muscles, which connect to bones, facilitate a vast array of movements and contribute to joint stability. These muscles make up 30% to 40% of our total body mass and are under our voluntary control. They work in tandem with tendons, ligaments, and bones to provide the necessary support and protection for our internal organs.
Smooth muscles, on the other hand, are involuntary and line the inside of organs like the stomach and blood vessels. They play a vital role in digestion by moving food through the gastrointestinal tract and maintaining blood circulation. Additionally, smooth muscles in the uterus contract and expand during childbirth, facilitating the birth process.
Cardiac muscle, found exclusively in the heart, is another type of involuntary muscle. It is responsible for pumping blood throughout the body and creating our heartbeat. The walls of the heart's chambers are composed almost entirely of these muscle fibres, ensuring a constant supply of oxygen-rich blood to our organs.
The diaphragm, a dome-shaped muscle below the lungs, is instrumental in respiration. When it contracts, it enlarges the chest cavity, allowing the lungs to fill with air. Relaxation of the diaphragm pushes air out of the lungs, facilitating the breathing process.
In summary, muscles play a vital role in protecting internal organs from shock and friction. They work in harmony with the skeletal system, absorbing shocks and reducing friction in joints, thereby safeguarding the organs from potential damage. The various types of muscles in our bodies, including skeletal, smooth, and cardiac muscles, each play unique roles in supporting and protecting our vital organs, ensuring their optimal function and contributing to our overall health and well-being.
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The diaphragm muscle aids breathing
The human body has over 600 muscles that help us move, breathe, swallow, and stay alive. There are three types of muscles in the body: skeletal, cardiac, and smooth muscle. The diaphragm is a dome-shaped skeletal muscle that sits under the lungs and separates the chest cavity from the abdomen.
The diaphragm plays a critical role in helping us breathe and keeping us healthy. When we inhale, the diaphragm contracts and moves downward, creating more space in the chest cavity and allowing the lungs to expand. On exhaling, the diaphragm relaxes and moves upward in the chest cavity.
Several conditions, diseases, and injuries can affect the diaphragm, causing symptoms such as trouble breathing, chest pain, and tightness. For instance, neuromuscular disorders like multiple sclerosis (MS) and ALS can cause diaphragmatic palsy, or weakness of the diaphragm muscle. Additionally, conditions like chronic obstructive pulmonary disease (COPD) can prevent the diaphragm from working effectively by trapping air in the lungs and pushing down on the diaphragm.
Diaphragmatic breathing exercises can help strengthen the diaphragm and improve its efficiency. These exercises involve lying on your back with bent knees and placing one hand on your upper chest and the other just below your rib cage. You then breathe in slowly through your nose, allowing your stomach to move out against your hand. On exhaling, you tighten your abdominal muscles and let your stomach move in as you breathe out through pursed lips. Diaphragmatic breathing offers several benefits, including reducing blood pressure and heart rate, improving relaxation, and increasing oxygen levels in the blood.
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Muscles in the torso protect internal organs
The human body has more than 600 muscles that help us move, breathe, swallow, and stay alive. Muscles are pieces of soft tissue that work with bones, tendons, and ligaments to support our weight and move us. The musculoskeletal system is an organ system consisting of specialised tissues of bones and skeletal muscles.
The torso muscles work in conjunction with the bones of the spine and ribs to provide protection for the internal organs. The ribs form a cage that shelters the heart and lungs, and the bones of the spine, or backbone, protect the spinal cord, which is the pathway for messages between the brain and the body.
Additionally, muscles help protect the bones and organs by absorbing shock and reducing friction in the joints. They also play a role in maintaining normal body temperature, as almost 85% of the heat generated in the body comes from contracting muscles. When body heat falls below optimal levels, skeletal muscles increase their activity to generate heat.
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Cardiac muscle makes up heart layers
The human body has more than 600 muscles that help us move, breathe, swallow, and stay alive. Muscles are pieces of soft tissue that help hold our body still and move our body. They also support and move our organs.
One of the most important organs in our body is the heart, which is also a muscle. The heart has three layers: the pericardium, the myocardium, and the endocardium. The myocardium, or cardiac muscle, makes up the thick middle layer of the heart. It is surrounded by a thin outer layer called the epicardium or visceral pericardium and an inner endocardium. The cardiac muscle is responsible for the contractility of the heart and, therefore, the pumping action. The heart is an involuntary muscle that beats on its own without our input.
Cardiac muscle is made up of sarcomeres that allow for contractility. Sarcomeres are composed of long proteins that organize into thick and thin filaments, called myofilaments. The myofilaments slide past each other as the muscle contracts and relaxes. This process is activated by the release of calcium from the sarcoplasmic reticulum (SR) when delivering an action potential to the muscle, in a process called excitation-contraction coupling. The sliding of actin and myosin past each other produces the formation of “cross-bridges,” which causes contraction of the heart and the generation of force. The cardiac muscle must contract with enough force and blood to supply the metabolic demands of the entire body. This is termed cardiac output and is defined as heart rate multiplied by stroke volume.
The individual cardiac muscle cell (cardiomyocyte) is a tubular structure composed of chains of myofibrils. Cardiomyocytes are the individual cells that make up the cardiac muscle. Their primary function is to contract, which generates the pressure needed to pump blood through the circulatory system. The rapid, involuntary contraction and relaxation of the cardiac muscle are vital for pumping blood throughout the cardiovascular system. Regular cardio exercise can help lower blood pressure, reduce heart rate, and make the heart pump more effectively.
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Smooth muscles aid childbirth
There are over 600 muscles in the human body, which help us move, breathe, swallow and stay alive. They also move and support our organs. The three types of muscles in the body are skeletal, cardiac and smooth muscle. Smooth muscles are involuntary muscles that line the inside of some organs.
The uterus is a smooth muscle organ that undergoes profound, largely reversible, changes during pregnancy. These changes are orchestrated by ovarian hormones and allow the uterus to adapt to the growing fetus. Smooth muscles make up the bulk of the uterine wall and generate the forceful contractions that accompany childbirth. The onset of labour is a complex process that requires a host of regulatory pathways working in concert.
The pelvic floor muscles also work hard during childbirth, helping to guide the baby through the birth canal. They work with the uterus to aid in the process of childbirth. In early labour, the pelvic floor muscles prepare for the upcoming stages by gradually loosening and softening. As contractions begin, the uterus pushes downward, causing slight stretching in the pelvic floor. This is the body’s natural response to ready the pelvic area for childbirth.
Prenatal physical therapy can enhance the body’s readiness for childbirth and aid in a smoother recovery. Working with a pelvic floor physical therapist during pregnancy can help prepare the body for labour. Strengthening exercises, such as Kegels, can enhance the endurance and flexibility of the pelvic floor, preparing it for the rigors of labour.
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Frequently asked questions
Muscles are pieces of soft tissue throughout your body that help you move, breathe, swallow and stay alive. There are three types of muscle tissue in the body: skeletal, cardiac and smooth muscle.
Skeletal muscles are the most common type of muscle in the body. They comprise 30% to 40% of your total body mass and are attached to bones, allowing you to perform a wide range of movements and functions.
Smooth muscles are involuntary muscles that line the inside of some organs and blood vessels. They are controlled by the autonomic nervous system and help with digestion and blood circulation.
Cardiac muscles are involuntary muscles that make up the middle layers of the heart. They squeeze and relax to pump blood through the cardiovascular system.
Muscles in the torso protect the internal organs at the front, sides and back of the body. The diaphragm, a dome-shaped muscle below the lungs, helps with breathing by pushing down on the chest cavity, causing the lungs to fill with air.
