Muscles

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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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  • 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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  • 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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  • 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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  • How many muscles are there in your face?

    Q: How many muscles are there in your face?

    A: According to Discovery Communications, the human face typically has 43 muscles. However, due to the complex muscular structure and the dense grouping of muscles, sometimes fewer than 43 are found on some people.
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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 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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  • Do bicep muscle curls work?

    Q: Do bicep muscle curls work?

    A: Although biceps curls work to build the biceps muscles, according to Throwback Fit, they are a very ineffective exercise for this purpose. Muscle & Fitness suggests making small changes to biceps curls that make the exercises more effective.
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  • How is oxygen transported to the muscles?

    Q: How is oxygen transported to the muscles?

    A: As with all tissues dependent on a vascular supply, muscles depend on red blood cells to transport oxygen to them. Red blood cells, in turn, rely on an oxygen transport protein called hemoglobin to carry oxygen to all parts of the body.
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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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  • 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 muscle tissue allows you to move your eyeballs?

    Q: What muscle tissue allows you to move your eyeballs?

    A: Six extraocular muscles allow the eyeballs to move: the inferior, superior, lateral and medial rectus muscles together with the inferior and superior oblique muscles. Vision Aware adds that the muscles that move the eyeballs are attached to the sclera, a white outer coating that covers the eyeball.
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  • Do girls have groin muscles?

    Q: Do girls have groin muscles?

    A: Yes, girls and women have groin muscles. The groin is actually a group of five muscles that attach the thigh to the pelvis, and everyone has these muscles. They are also called the "adductors."
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  • What is the main function of the quadriceps?

    Q: What is the main function of the quadriceps?

    A: The quadriceps, also known as the thigh muscles, move the knee and the hip, and they prevent the knee from buckling. The quadriceps are engaged when doing squats, climbing stairs, standing up and walking.
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  • How are muscles attached to bone?

    Q: How are muscles attached to bone?

    A: Most muscles are attached to bones by connecting tendons. Tendons are thick, tough cords of tissue that firmly attach to both the muscle and the bone, connecting the two. A few muscles attach directly to the bone without a connecting tendon.
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  • How do muscles respond to exercise?

    Q: How do muscles respond to exercise?

    A: According to MedicineNet, muscles respond to exercise through contraction and resistance, both of which eventually result in increased muscular strength. Neural impulses direct fibers to contract, resulting in voluntary exercise. There are three different types of muscles that are worked during exercise, including skeletal, smooth and cardiac muscle, and each one responds differently to physical exercise.
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  • What muscles are used when walking?

    Q: What muscles are used when walking?

    A: The muscle groups used when walking include the calf muscles, tibialis anterior and ankle extensor muscles, hamstring muscles and quadriceps muscles, according to HowStuffWorks. The hip flexor muscles, buttock muscles, abdominal muscles, and arm and shoulder muscles are also used.
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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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  • What are dynamic and static contractions?

    Q: What are dynamic and static contractions?

    A: A static (or isometric) contraction occurs when a muscle generates force while the joint angle remains the same. An example would be what happens when a person pushes against a wall. The muscles contract but the joint remains unmoved. A dynamic (or isotonic) contraction occurs when the force generated by the muscle causes movement in the joint. Dynamic contractions occur during most physical activities.
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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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  • 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 is enthesopathy of the hip region?

    Q: What is enthesopathy of the hip region?

    A: Enthesopathy of the hip is an arthritic disorder in the sockets of the hip bone that affects the tendons and ligaments that are attached there. This means that the connections are not working correctly or are damaged in some way, creating problems with the connecting tissues between the hips and other bones. This causes pain or difficulty while moving or walking.
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