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The muscular system is the body's network of tissues that controls movement both of the body and within it such as the heart's pumping action and the movement of food through the gut. Movement is generated through the contraction and relaxation of specific muscles. The muscles of the body are divided into two main classes: Skeletal muscles are attached to the skeleton and move various parts of the body.

They are called voluntary because a person controls their use, such as in the flexing of an arm or the raising of a foot. There are about skeletal muscles in the whole human body. Smooth muscles are found in the stomach and intestinal walls, vein and artery walls, and in various internal organs.

They are called involuntary muscles because a person generally cannot consciously control them. They are regulated by the autonomic nervous system part of the nervous system that affects internal organs.

Another difference between skeletal and smooth muscles is that skeletal muscles are made of tissue fibers that are striated or striped. These alternating bands of light and dark result from the pattern of the filaments threads within each muscle cell. Smooth muscle fibers are not striated. The cardiac or heart muscle also called myocardium is a unique type of muscle that does not fit clearly into either of the two classes of muscle.

Like skeletal muscles, cardiac muscles are striated. But like smooth muscles, they are involuntary, controlled by the autonomic nervous system. The longest muscle in the human body is the sartorius pronounced sar-TOR-ee-us. It runs from the waist down across the front of thigh to the knee. Its purpose is to flex the hip and knee. It moves the thighbone away from the body and straightens out the hip joint. Skeletal muscles are probably the most familiar type of muscle.

They are the muscles that ache after strenuous work or exercise. Skeletal muscles make up about 40 percent of the body's mass or weight. They stabilize joints, help maintain posture, and give the body its general shape. They also use a great deal of oxygen and nutrients from the blood supply. Skeletal muscles are attached to bones by tough, fibrous connective tissue called tendons. Tendons are rich in the protein collagen, which is arranged in a wavy way so that it can stretch and provide additional length at the muscle-bone junction.

Part of the nervous system that regulates involuntary action, such as of the heart and intestines. Muscle that contracts and causes a joint to open. Muscle that contracts and causes a joint to close. Area where a muscle and a nerve connect. Tough, fibrous connective tissue that attaches muscle to bone. Skeletal muscles act in pairs.

The flexing contracting of one muscle is balanced by a lengthening relaxation of its paired muscle or a group of muscles. These antagonistic opposite muscles can open and close joints such as the elbow or knee. An example of antagonistic muscles are the biceps muscles in the front of the upper arm and the triceps muscles in the back of the upper arm. When the biceps muscle flexes, the forearm bends in at the elbow toward the biceps; at the same time, the triceps muscle lengthens.

When the forearm is bent back out in a straight-arm position, the biceps lengthens and the triceps flexes. Muscles that contract and cause a joint to close, such as the biceps, are called flexor muscles. Those that contract and cause a joint to open, such as the triceps, are called extensors. Skeletal muscles that support the skull, backbone, and rib cage are called axial skeletal muscles. Skeletal muscles of the limbs arms and legs are called distal skeletal muscles.

Skeletal muscle fibers are stimulated to contract by electrical impulses from the nervous system. Nerves extend outward from the spinal cord to connect to muscle cells. The area where a muscle and a nerve connect is called the myoneural juncture.

When instructed to do so, the nerve releases a chemical called a neurotransmitter that crosses the microscopic space between the nerve and the muscle and causes the muscle to contract. Skeletal muscle fibers are characterized as fast or slow based on their activity patterns.

Fast also called white muscle fibers contract. Close-up of striated skeletal muscle. Reproduced by permission of Photo Researchers, Inc. Slow also called red muscle fibers contract more slowly, have better blood supplies, operate with oxygen, and do not tire as easily. Slow muscle fibers are used in movements that are ongoing, such as maintaining posture.

Smooth muscle fibers line most of the internal hollow organs of the body, such as the intestines, stomach, and uterus womb. They help move substances through tubular areas such as blood vessels and the small intestines. Smooth muscles contract automatically, spontaneously, and often rhythmically. They are slower to contract than skeletal muscles, but they can remain contracted longer.

Human skeletal muscles anterior view. Like skeletal muscles, smooth muscles contract in response to neurotransmitters released by nerves. Unlike skeletal muscles, some smooth muscles contract after being stimulated by hormones chemicals secreted by glands. An example is oxytocin, a hormone released by the pituitary gland. It stimulates the smooth muscles of the uterus to contract during childbirth. Smooth muscles are not as dependent on oxygen as skeletal muscles are.

Smooth muscles use carbohydrates to generate much of their energy. The cardiac muscle or myocardium contracts beats more than 2. Like skeletal muscles, myocardium is striated. However, myocardial muscle fibers are smaller and shorter than skeletal muscle fibers. The contractions of the myocardium are stimulated by an impulse sent out from a small clump node of specialized tissue in the upper right area of the heart.

The impulse spreads across the upper area of the heart, causing this region to contract. This impulse also reaches another node, located near the lower right area of the heart. After receiving the initial impulse, the second node fires off its own impulse, causing the lower region of the heart to contract slightly after the upper region. The most common muscular disorder is injury from misuse. Skeletal muscle sprains and tears cause excess blood to seep into the tissue in order to heal it.

The remaining scar tissue results in a slightly shorter muscle. Overexertion or a diminished blood supply can cause muscle cramping. Diminished blood supply and oxygen to the heart muscle causes chest pain called angina pectoris. Human skeletal muscles posterior view.

The most common type of genetic inherited muscular disorder is muscular dystrophy. This disease causes muscles to progressively waste away. There are six forms of muscular dystrophy. The most frequent and most dreaded form appears in boys aged three to seven. Boys are usually affected because it is a sex-linked condition; girls are carriers of the disease and are usually not affected.

The first symptom of the disease is a clumsiness in walking. This occurs because the muscles of the pelvis and the thighs are first affected. The disease spreads to muscles in other areas of the body, and by the age of ten, a child is usually confined to a wheelchair or a bed. Death usually occurs before adulthood. Another form of muscular dystrophy appears later in life and affects both sexes equally.

The first signs of the disease appear in adolescence. The muscles affected are those in the face, shoulders, and upper arms. People with this form of the disease may survive until middle age. Words to Know Autonomic nervous system: Also read article about Muscular System from Wikipedia. This website offers a lot of useful information that's not easy to find.

It's good to know it's here. When using this site, goodness gracious, I finished my whole 5 paragraph essay on the Muscular System. I really like the kind of work you guys did. I really apreciate it this is one of the most incredible site and I like it. All i want i to conclude and say thank you for the creatio of this webpage. I hope that You create more helpfull education webpage for students whom have trouble on their homework. Hey i just wanted to say this so far has been the best site i have seen that talks about all i need to know about the 12body systems I only have 4 days to complete a project, and this site is the only reason I will actually be able to do it, and not fail:

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Horny mature guys getting it on with cute younger studs! See intergenerational gay couples shooting their loads from all the kinky stuff they do together! They are regulated by the autonomic nervous system part of the nervous system that affects internal organs. Another difference between skeletal and smooth muscles is that skeletal muscles are made of tissue fibers that are striated or striped.

These alternating bands of light and dark result from the pattern of the filaments threads within each muscle cell. Smooth muscle fibers are not striated. The cardiac or heart muscle also called myocardium is a unique type of muscle that does not fit clearly into either of the two classes of muscle.

Like skeletal muscles, cardiac muscles are striated. But like smooth muscles, they are involuntary, controlled by the autonomic nervous system.

The longest muscle in the human body is the sartorius pronounced sar-TOR-ee-us. It runs from the waist down across the front of thigh to the knee.

Its purpose is to flex the hip and knee. It moves the thighbone away from the body and straightens out the hip joint. Skeletal muscles are probably the most familiar type of muscle. They are the muscles that ache after strenuous work or exercise. Skeletal muscles make up about 40 percent of the body's mass or weight. They stabilize joints, help maintain posture, and give the body its general shape.

They also use a great deal of oxygen and nutrients from the blood supply. Skeletal muscles are attached to bones by tough, fibrous connective tissue called tendons. Tendons are rich in the protein collagen, which is arranged in a wavy way so that it can stretch and provide additional length at the muscle-bone junction.

Part of the nervous system that regulates involuntary action, such as of the heart and intestines. Muscle that contracts and causes a joint to open. Muscle that contracts and causes a joint to close. Area where a muscle and a nerve connect. Tough, fibrous connective tissue that attaches muscle to bone. Skeletal muscles act in pairs. The flexing contracting of one muscle is balanced by a lengthening relaxation of its paired muscle or a group of muscles.

These antagonistic opposite muscles can open and close joints such as the elbow or knee. An example of antagonistic muscles are the biceps muscles in the front of the upper arm and the triceps muscles in the back of the upper arm. When the biceps muscle flexes, the forearm bends in at the elbow toward the biceps; at the same time, the triceps muscle lengthens.

When the forearm is bent back out in a straight-arm position, the biceps lengthens and the triceps flexes. Muscles that contract and cause a joint to close, such as the biceps, are called flexor muscles.

Those that contract and cause a joint to open, such as the triceps, are called extensors. Skeletal muscles that support the skull, backbone, and rib cage are called axial skeletal muscles. Skeletal muscles of the limbs arms and legs are called distal skeletal muscles. Skeletal muscle fibers are stimulated to contract by electrical impulses from the nervous system. Nerves extend outward from the spinal cord to connect to muscle cells.

The area where a muscle and a nerve connect is called the myoneural juncture. When instructed to do so, the nerve releases a chemical called a neurotransmitter that crosses the microscopic space between the nerve and the muscle and causes the muscle to contract. Skeletal muscle fibers are characterized as fast or slow based on their activity patterns.

Fast also called white muscle fibers contract. Close-up of striated skeletal muscle. Reproduced by permission of Photo Researchers, Inc. Slow also called red muscle fibers contract more slowly, have better blood supplies, operate with oxygen, and do not tire as easily. Slow muscle fibers are used in movements that are ongoing, such as maintaining posture.

Smooth muscle fibers line most of the internal hollow organs of the body, such as the intestines, stomach, and uterus womb. They help move substances through tubular areas such as blood vessels and the small intestines. Smooth muscles contract automatically, spontaneously, and often rhythmically.

They are slower to contract than skeletal muscles, but they can remain contracted longer. Human skeletal muscles anterior view. Like skeletal muscles, smooth muscles contract in response to neurotransmitters released by nerves. Unlike skeletal muscles, some smooth muscles contract after being stimulated by hormones chemicals secreted by glands. An example is oxytocin, a hormone released by the pituitary gland.

It stimulates the smooth muscles of the uterus to contract during childbirth. Smooth muscles are not as dependent on oxygen as skeletal muscles are. Smooth muscles use carbohydrates to generate much of their energy. The cardiac muscle or myocardium contracts beats more than 2. Like skeletal muscles, myocardium is striated. However, myocardial muscle fibers are smaller and shorter than skeletal muscle fibers. The contractions of the myocardium are stimulated by an impulse sent out from a small clump node of specialized tissue in the upper right area of the heart.

The impulse spreads across the upper area of the heart, causing this region to contract.

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