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Muscular System

The muscular system allows humans to move. Muscles also provide strength, balance and heat.

11,239 Questions

What muscles does upright rows work out?

The upright row is a weight training exercise. This exercise involves the trapezius, the deltoids and the biceps. The narrower the grip the more the trapezius muscles are exercised, as opposed to the deltoids.

The more moveable attachment point of a muscle is called the?

The origin is the "immovable" point of attachment of a muscle to a bone.

What 3 muscle make up the pes anserinus attachment?

Pes anserinus ("goose foot") refers to the conjoined tendons of three muscles: the sartorius, gracilis and semitendinosus.

How do you treat intercostal muscle strain?

It's easy to treat the intercostals. Run your opposite hand finger tip between your ribs. Press in deeply and feel for a painful point that may even feel like a bump under your finger tip. If you find one (or more) just press and hold for 60 seconds, then continue holding while you take in a long, slow, breath. Then look for more points.

Eventually you can then start to gently stretch the intercostals by raising the arm of the side you are stretching over your head and then extending this side to the opposite.

Why can't the deltoid initiate abduction of the shoulder when the arm is by the side?

When the arm is fully adducted, the line of pull of the deltoid coincides with the axis of the humerus; thus, it pulls directly upward on the bone and cannot initiate or produce abduction. This is why it requires assistance from the supraspinatis muscle to initiate abduction.

From Clinically Oriented Anatomy, Seventh Edition, by Keith L. Moore, Arthur F. Dalley, and Anne M.R. Agur

The main organs of the muscular system?

The major organs of the Muscular System are the muscles. The 3 types of muscles are the smooth, cardiac, and skeletal muscles.

What are the main muscles in the human muscular system?

That's pretty vague. To name a few: Biceps Brachii- flexes and supinates the forearm, long head can also assist in flexing the humerus

The largest is the Gluteus Maximus (your butt muscle)- powerful extensor of the thigh, lateral rotator of the thigh, helps steady the extended leg; extends the trunk when distal end is fixed

Rectus abdominis- flexes vertebral colum, tenses anterior abdominal wall; compresses abdominal contents

Is skeletal muscle Involuntary?

The skeletal muscle is voluntary. Voluntary muscles are the muscles that you have the ability to control. This includes moving your arm, chewing, or moving your legs. Involuntary muscles are muscles you have no control over. A good example of that would be smooth muscles that help with digestion.

What changes occur in the muscles during exercise?

I'll give you the basics of it:

When you exercise and you feel that burn during and after a workout, that is the muscles fibers tearing up. After your workout it is very important to eat well because the process of your muscles rebuilding takes longer that it does to tear them up. The muscles will repair and rebuild bigger than before you exercised. You could work out vigorously and not eat right and you wouldn't gain much muscle. Eating right and working out itself are equally important. A common misconception is people believe you need to spend hours a day at the gym in order to build muscle. It can be as easy as working out one area of the body (arms) once a week doing no more than 5 separate exercises. The most important thing to do while working out: doing it right (technique is everything).

Why a biceps muscle needs a good supply of blood?

Blood delivers sugars and oxygen to the muscle cells, which are necessary for the production of energy.

How many muscles does the human arm have?

there about 50 muscles in your arm and hand and i don't know how many are in the sholder

When you bend your elbo what is the triceps muscle acting as in relation to the biceps muscle?

when you bend your elbow, what is the triceps muscle acting as in relation to the biceps muscle

Is your lip a muscle?

Lips are built out of muscle, with a covering of skin.

What is the difference of the three types of muscles?

There are three types of muscle tissue found in the human body. There are visceral muscles, which consist of smooth muscle tissue, which is controlled by the autonomic nervous system and responds to both hormones and neural stimulation. Smooth muscles have no striations, as the nucleus is centrally located. Thus, they are involuntarily controlled. Then, there is cardiac muscle, which is only found in the heart and is also stimulated by neural activity and hormones. Lastly, there are skeletal muscles, which aid in the movement of the body and is mostly attached to bones by means of tendons. These muscles are striated, and are voluntarily controlled. Skeletal muscles can further be sub-divided into two categories: red and white muscles. Red skeletal muscle tissue consists of a chemical not found in the white skeletal muscle called myoglobin. Myoglobin is a protein-like molecule, which aids in the storage of oxygen, which is essential to its function. Thus, this extra molecule is responsible for giving red muscles their coloring.

Which muscles do you use to nod?

The sternocleidomastoid muscles are the major muscles that assist you in flexing the neck, along with the longus capitis and a few other small deep muscles of the anterior neck. These flex the neck and head forward or anteriorly.

The splenius capitis, semispinalis capitis and longissimus capitis are the major extensor muscles of the neck. These extend the neck upward and backward or posteriorly.

What are muscles called that work in opposition with each other?

Antagonistic muscle pairs. That means to work in opposition to each other.
One muscle produces movement in one direction and the other muscle produces movement in the opposite direction. It would seem to be contradictory but a very smooth movement occurs when they work this way.

What muscles are used to play rugby?

All muscles are used in the game of rugby. However, certain muscles are focused on for different positions. Fowards: Train backs, necks, shoulders, abs, pecs, and quads (mainly for driving). Arms are helpful too. Backs: legs and good arms (for running and tackling). However, in case one ends up in a ruck or maul (or just doesn't want to get hurt due to insufficient conditioning), the muscles trained by the fowards are helpful (except maybe the neck). Both require very strong quads. Fowards use this to drive, and backs to run fast (and drive occasionally). Also very necessary for the tackle.

What is the largest and strongest muscles in the human body?

Since three factors affect muscular strength simultaneously and muscles never work individually, it is misleading to compare strength in individual muscles, and state that one is the "strongest". But below are several muscles whose strength is noteworthy for different reasons.

  • In ordinary parlance, muscular "strength" usually refers to the ability to exert a force on an external object-for example, lifting a weight. By this definition, the masseter or jaw muscle is the strongest. The 1992 Guinness Book of Records records the achievement of a bite strength of 4,337 N (975 lbf) for 2 seconds. What distinguishes the masseter is not anything special about the muscle itself, but its advantage in working against a much shorter lever arm than other muscles.
  • If "strength" refers to the force exerted by the muscle itself, e.g., on the place where it inserts into a bone, then the strongest muscles are those with the largest cross-sectional area. This is because the tension exerted by an individual skeletal muscle fiber does not vary much. Each fiber can exert a force on the order of 0.3 micronewton. By this definition, the strongest muscle of the body is usually said to be the quadriceps femoris or the gluteus maximus.
  • A shorter muscle will be stronger "pound for pound" (i.e., by weight) than a longer muscle. The myometrial layer of the uterus may be the strongest muscle by weight in the female human body. At the time when an infant is delivered, the entire human uterus weighs about 1.1 kg (40 oz). During childbirth, the uterus exerts 100 to 400 N (25 to 100 lbf) of downward force with each contraction.
  • The external muscles of the eye are conspicuously large and strong in relation to the small size and weight of the eyeball. It is frequently said that they are "the strongest muscles for the job they have to do" and are sometimes claimed to be "100 times stronger than they need to be." However, eye movements (particularly saccades used on facial scanning and reading) do require high speed movements, and eye muscles are exercised nightly during rapid eye movement sleep.
  • The statement that "the tongue is the strongest muscle in the body" appears frequently in lists of surprising facts, but it is difficult to find any definition of "strength" that would make this statement true. Note that the tongue consists of eight muscles, not one.
  • The heart has a claim to being the muscle that performs the largest quantity of physical work in the course of a lifetime. Estimates of the power output of the human heart range from 1 to 5 watts. This is much less than the maximum power output of other muscles; for example, the quadriceps can produce over 100 watts, but only for a few minutes. The heart does its work continuously over an entire lifetime without pause, and thus does "outwork" other muscles. An output of one watt continuously for eighty years yields a total work output of two and a half gigajoules.