Muscles

A:

As explained by Amy Balsinger of Davidson University, sarcomeres are the basic contractile unit of muscles. Each muscle fiber contains hundreds of sarcomeres, which are repeating subunits of myofibril proteins. Muscles contract by sliding the thin actin filaments and thick myosin filaments along each other.

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  • What Are the Major Muscles in the Body?

    Q: What Are the Major Muscles in the Body?

    A: The major muscle groups in the body are the abdominal muscles, biceps, deltoids, erector spinae, gastrocnemius, soleus, gluteus, hamstrings, latissimus dorsi, rhomboids, obliques, pectoralis, quadriceps, trapezius and triceps. Each muscle group contributes to a variety of different functions, such as walking, climbing and sitting.
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  • What Muscles Are Used in Sprinting?

    Q: What Muscles Are Used in Sprinting?

    A: The gluteus maximus, hamstrings and quadriceps are large muscle groups used while sprinting. Other large muscle groups used are the gastrocnemius and soleus and hip flexors.
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  • What Is the Muscle That Allows You to Shrug Your Shoulders?

    Q: What Is the Muscle That Allows You to Shrug Your Shoulders?

    A: Shrugging of the shoulders is primarily accomplished by the upper region of the trapezius muscle. The upper trapezius extends from the shoulder blade up to the back of the neck and is a common target of weight training exercises.
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  • How Many Muscles Does It Take to Talk?

    Q: How Many Muscles Does It Take to Talk?

    A: Four main muscles are required for talking. These are the thyroarytenoid muscles, or vocalis muscles; the posterior cricoarytenoid muscles; the lateral cricoarytenoid muscle and the interarytenoid muscle.
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  • How Many Muscles Are in a Human Tongue?

    Q: How Many Muscles Are in a Human Tongue?

    A: Despite myths hailing it to be the strongest single muscle in the body, the human tongue is actually comprised of eight different muscles, according to the Richmond Smile Center. The muscles that comprise the tongue are skeletal muscles.
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  • What Happens When Muscles Get Tired?

    Q: What Happens When Muscles Get Tired?

    A: According to Gatorade Sports Science Institute, muscles hurt when they tire due to the accumulation of lactic acid. Muscles produce energy by converting glycogen into adenosine triphosphate with the release of acid and carbon dioxide. Muscles tire quickly during heavy exercises causing a demand for more energy. When the amount of oxygen supply to exercising muscles is limited, aerobic respiration takes place, resulting in an acidic environment within muscle fibers.
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  • When Will a Woman's Biceps Start to Grow?

    Q: When Will a Woman's Biceps Start to Grow?

    A: Women are incapable of developing their muscles, including the biceps, to the extent of most men due to their lack of testosterone. A woman's biceps, however, can still grow larger and stronger through exercises, such as the dumbbell curl and the chin-up that target this muscle and related muscles.
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  • What Are the Muscles Used to Swing a Baseball Bat?

    Q: What Are the Muscles Used to Swing a Baseball Bat?

    A: According to BodyBuilding, the main muscles used when swinging a baseball bat are the abdominal muscles, back muscles, leg muscles and forearms muscles. However, in order to increase overall bat swing power, the entire body should be trained so as to help the body work together more efficiently.
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  • How Many Muscles Move Your Hand?

    Q: How Many Muscles Move Your Hand?

    A: According to Clinical Anatomy For Dummies, there are a total of 18 intrinsic muscles that work to move each hand. These muscles are in three groups: the thenar muscles, the hypothenar muscles and the interosseous muscles and the lumbricals.
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  • What Are the Differences in Structure and Function of the Three Main Muscle Types?

    Q: What Are the Differences in Structure and Function of the Three Main Muscle Types?

    A: MedlinePlus explains that the human body has three different types of muscles: skeletal, cardiac and smooth. These muscle groups have different functions, are located in different parts of the body and have different structures.
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  • Where Are Your Glutes Located?

    Q: Where Are Your Glutes Located?

    A: The glutes, or gluteal muscles, are located on the back of the pelvis region in humans. These muscles combine with a layer of fat to provide a cushiony layer of flesh to sit on.
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  • What Is the Shortest Muscle in the Body?

    Q: What Is the Shortest Muscle in the Body?

    A: The stapedius muscle, which is the shortest muscle in the human body (at a mere millimeter in length), holds the stapes in place inside the tympanic cavity of the ear. The stapedius works in conjunction with the smallest bone in the body to aid the function of hearing.
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  • How Much Does the Human Heart Weigh?

    Q: How Much Does the Human Heart Weigh?

    A: The average weight of a man’s heart is 10 ounces, and the average weight of a women’s heart is 8 ounces. The average heart rate for women is 78 beats per minute, and the average heart rate for men is 70 beats per minute.
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  • Which Muscles Are Used During a Baseball Swing?

    Q: Which Muscles Are Used During a Baseball Swing?

    A: The whole body is involved in a baseball swing, with legs, forearms, wrists, abdominal muscles, hips and lower back muscles playing the most important roles, according to Bob Alejo for BodyBuilding.com. Hitting coaches concentrate on strengthening these and other muscles with weight training, calisthenics and resistance-based exercises.
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  • What Is the Function of the Diaphragm?

    Q: What Is the Function of the Diaphragm?

    A: The diaphragm is a sheet of muscle that stretches like a dome over the organs of the upper abdomen and serves as a boundary between the abdominal cavity and the thoracic. It separates the lungs from the main body cavity and, together with the ribs, forms a seal that allows the lungs to inflate as part of the process of respiration.
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  • How Many Muscles Does It Take to Smile or Frown?

    Q: How Many Muscles Does It Take to Smile or Frown?

    A: It is difficult to say how many muscles it takes to smile or frown because all people make different expressions when smiling and frowning. What might be a thoughtful look for one person is another person's frown. The number of facial muscles present also varies between individuals.
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  • What Does It Mean If You Can Tie a Cherry Stem With Your Tongue?

    Q: What Does It Mean If You Can Tie a Cherry Stem With Your Tongue?

    A: If someone can tie a cherry stem into a knot with their tongue, that suggests they may be a good kisser due to the oral dexterity required to perform the feat. It is a common trick performed at bars due to the presence of Maraschino cherries as drink garnishes.
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  • What Body Parts Are Used to Extend the Hip When Climbing Stairs?

    Q: What Body Parts Are Used to Extend the Hip When Climbing Stairs?

    A: The body parts involved in hip extension when climbing stairs are the torso and lower back, opposite leg, knee and ankle, and hip joints. Hip extension during stair climbing occurs when the opposite leg is raised to the next step.
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  • What Muscles Make You Punch Harder?

    Q: What Muscles Make You Punch Harder?

    A: Strengthening the upper arm, forearm, shoulders and chest muscles allows for a harder punch to be thrown. The back muscles play a part in how hard of a punch is thrown as well.
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  • How Do the Muscles Work in a Bicep Curl?

    Q: How Do the Muscles Work in a Bicep Curl?

    A: The bicep, like other muscles, is primarily controlled by the cerebrum, a section of the brain located just above the brain stem and the cerebellum. The peripheral nervous system relies on the cerebrum to send signals to the bicep's short and long heads so that they function as a single muscle as the bicep contracts during the curl.
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  • What Muscles Do Crunches Work?

    Q: What Muscles Do Crunches Work?

    A: The crunch exercise primarily works the rectus abdominis, transversus abdominis and oblique muscles. The rectus abdominis muscles form the six-pack and are located perpendicularly along the front of the stomach. These muscles are part of the core, which supports bending and standing up.
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