Dominic Stone
The human body is made up of hundreds of muscles, which are pieces of soft tissue that help us move, breathe, swallow and stay alive. There are three types of muscles: cardiac, smooth and skeletal. The largest muscles in the body are the gluteus maximus, or glutes, followed by the quadriceps, lats, hamstrings and pectoral muscles. The glutes are considered one of the most powerful muscles in the body, as they are critical in almost every big movement we perform, from walking to climbing stairs.
| Characteristics | Values |
|---|---|
| Number of muscles in the human body | 600-840 |
| Percentage of body weight | 40% |
| Types | Cardiac, Smooth, Skeletal |
| Largest muscle group | Quads |
| Second-largest muscle group | Gluteus Maximus |
| Third-largest muscle group | Calves |
| Largest upper-body muscle group | Delts |
| Smallest muscle group | Biceps |
| Skeletal muscle fibres | Long, straight, multinucleated |
| Skeletal muscle function | Contract to move parts of the body closer to the bone |
| Skeletal muscle control | Voluntary |
| Smooth muscle control | Involuntary |
| Visceral muscle control | Involuntary |
| Muscle movement | Shortening their length, pulling on tendons, moving bones closer together |
| Muscle functions | Holding the body still, running, moving, breathing, swallowing, keeping the body alive |
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What You'll Learn
The largest muscle groups in the body
The human body is made up of more than 600 muscles, which are pieces of soft tissue that help us move, breathe, swallow and stay alive. There are three types of muscles in the human body: cardiac, smooth and skeletal. Cardiac muscle makes up the wall of the heart and is responsible for the forceful contraction of the heart. Smooth muscles line some of our organs and make up the walls of the intestine, the uterus, blood vessels, and internal muscles of the eye. Skeletal muscles are attached to the bones and in some areas the skin, and their contraction helps limbs and other body parts move.
The largest muscle in the human body is the gluteus maximus, which is part of the glutes muscle group. The glutes are the muscles of the buttocks and are the largest muscles in the body. They are key in the movement of the legs backward and sideways, and also help to maintain balance when walking or running. The gluteus maximus is large and powerful because it has the job of keeping the trunk of the body in an erect posture.
The second-largest muscle group is the quadriceps or 'quads', which are the four muscles that comprise the front of the thigh. The quads are the biggest muscle group in the body for both men and women. The four muscles are the rectus femoris, vastus lateral, vastus intermedius, and vastus medialis. The quads are followed in size by the calves, which are huge and powerful as they pull against the force of gravity to keep the body upright.
The hamstrings are another huge muscle group, located in the upper back part of the thighs. Their main function is to bend the knees and help propel the body forward in activities such as walking, running, jumping, or kicking.
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The strongest muscles in the body
The human body is made up of over 600 muscles that help us move, breathe, swallow, and stay alive. There are three types of muscles: cardiac, smooth, and skeletal. While there are many big muscles in the human body, there is no one answer to which is the strongest as there are different ways to measure strength.
If you define strength as the ability to exert the most pressure, the strongest muscle in the human body is the masseter muscle, which is the jaw muscle. The masseter muscle can close the teeth with a force as great as 55 pounds (25 kilograms) on the incisors or 200 pounds (90.7 kilograms) on the molars. The Guinness Book of World Records claims the strongest bite ever recorded was 975 pounds of force!
However, some people might equate "strongest" with "works the hardest." By this definition, the strongest muscle in the body is the heart, which beats thousands of times a day over a lifetime to keep us alive.
The tongue, which is made up of eight different muscles, is also very strong and flexible, but it cannot claim the title of the strongest muscle in the human body. The muscles of the eye are also strong, as they are constantly moving to readjust the position of the eye, even when the head is in motion.
In terms of the largest average muscle size, the gluteus maximus or buttocks are the largest muscles in the body, followed by the quadriceps, lats, hamstrings, and pectoral muscles. The quads are the biggest muscle group in the body, for both men and women. The glutes are also considered some of the strongest muscles in the body, along with the quadriceps.
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How muscles move the body
The human body has over 600 muscles that help with performing a myriad of functions, from involuntary ones like breathing to voluntary ones such as walking. Muscles are pieces of soft tissue throughout your body that help you move, breathe, swallow, and stay alive. They perform two types of movements: voluntary and involuntary.
Voluntary movements are actions you control. You choose to perform an action and your muscles move your body to make it happen. You use your nervous system to control these movements. Flicking your thumb to scroll through an article on your phone and sprinting around a track are both voluntary movements.
Involuntary movements happen automatically without you thinking about them. The muscles in and around your organs move involuntarily to keep your body working properly. Your heart beating and muscles in your chest and back moving your ribs when you breathe are examples of involuntary movements. Your muscles use a combination of voluntary and involuntary movements to work with nearly all your body’s systems and functions.
The principal functionality of muscle is rooted in its ability to contract and relax. The foundation for muscle contraction is the sarcomere, found in all muscle cells. Sarcomeres contain a motor protein called myosin, which powers the muscle to contract by “grabbing” onto another protein called actin and “flexing.” When the myosin releases the actin, the muscle relaxes. This process is regulated by another protein called troponin.
Skeletal muscles are voluntary — they move when you think about moving that part of the body. Some muscle fibers contract quickly and use short bursts of energy (fast-twitch muscles). Others move slowly, like your back muscles that help with posture. Cardiac muscle (myocardium) makes up the middle layers of your heart. It doesn’t exist anywhere else in your body. Cardiac muscle squeezes and relaxes to pump blood through your cardiovascular system. Your heart is an involuntary muscle — it beats on its own without your input. Smooth muscles are involuntary muscles that line the inside of some organs. They do essential jobs like moving waste through your intestines and helping your lungs expand when you breathe.
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Types of muscle tissue
Muscles are pieces of soft tissue that are present throughout the human body. They help the human body move, breathe, swallow, and stay alive. There are three types of muscles in the human body: skeletal, smooth, and cardiac.
Skeletal Muscles
Skeletal muscles are part of the musculoskeletal system and work with bones, tendons, and ligaments to support body weight and facilitate movement. These muscles are attached to the bones and, in some areas, the skin. Skeletal muscles are voluntary, meaning they move when you think about moving that part of the body. There are two major classifications of skeletal muscle: Type I (slow oxidative) and Type II (fast-twitch).
Cardiac Muscles
Cardiac muscle, also known as myocardium, makes up the middle layers of the heart. It is an involuntary, striated muscle that encloses the chambers of the heart and is responsible for the forceful contraction of the heart. The heart is the only organ in the body that is also a muscle.
Smooth Muscles
Smooth muscle tissue lines some of the organs in the body, including the intestine, uterus, blood vessels, and internal muscles of the eye. Smooth muscles make up the walls of these organs and facilitate their functioning.
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How to strengthen big muscles
Muscles are pieces of soft tissue that help us move, breathe, swallow, and stay alive. There are over 600 muscles in the human body, and they are all made of thousands of small fibres woven together. These fibres stretching and pressing together is what moves our organs and body parts.
There are three types of muscles in the human body: cardiac, smooth, and skeletal. Cardiac muscle makes up the wall of the heart and is responsible for its forceful contraction. Smooth muscles make up the walls of the intestine, the uterus, blood vessels, and internal muscles of the eye. Skeletal muscles are attached to the bones and, in some areas, the skin. Contraction of the skeletal muscles helps limbs and other body parts move.
The biggest muscle groups in the body are the quads, followed by the glutes, and then the calves. The hamstrings are also a large muscle group, but the upper body has far smaller muscle groups than the lower body.
To strengthen big muscles, weight training is the best method. This involves challenging the muscles to deal with higher levels of resistance or weight, which is known as muscle hypertrophy. This process of muscle growth occurs when the fibres of the muscles sustain damage or injury, and the body repairs these fibres by fusing them, increasing the mass and size of the muscles.
Compound exercises that work different muscles in one movement are great for building leg muscles. These include squats, deadlifts, and lunges. Free weights, like dumbbells, kettlebells, and barbells, are often better for muscle building than machines. However, machines are ideal if you have balancing issues or other limitations that make it safer to sit during weight training.
For older men, it is recommended to do fewer repetitions with heavier weights to gain the most muscle. An ideal routine would be eight repetitions for each exercise for three sets in total. However, this can be adjusted as needed. For example, people with movement issues might need to use lighter weights and do more repetitions. Lifting should be done at a seven-second tempo: three seconds to lift the weight, a one-second pause, and three seconds to lower it.
Cardiovascular exercise is also beneficial for muscle growth and overall health. Current guidelines recommend that adults participate in at least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity physical activity each week.
Additionally, diet plays a crucial role in building muscle. The body needs adequate protein and more calories to rebuild and grow muscle after workouts. The amount of protein required is approximately 1 gram per pound of body weight, which is the maximum amount the body can use in a day.
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Frequently asked questions
Muscles are pieces of soft tissue throughout the body that help us move, breathe, swallow, and stay alive. The largest muscles in the body take up around 40% of our body weight.
The gluteus maximus, or the buttocks, is the largest muscle in the human body. It is one of three gluteal muscles and is critical in almost every big movement we perform, including walking, jumping, sprinting, and climbing stairs.
The quads, or quadriceps, are the biggest muscle group in the body, followed closely by the calves. The hamstrings are also one of the five biggest muscles in the body.
The strongest muscles in the body include the masseter, which closes the jaw with a force as great as 200 pounds on the molars. The tongue is also strong, being the only muscle in the body that can actively contract and extend. The heart is the hardest-working muscle, beating a minimum of 2,500 gallons of blood through 60,000 miles of blood vessels daily.
