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.

See Full Answer
Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • What is the function of the trapezius muscle?

    Q: What is the function of the trapezius muscle?

    A: The primary use of the trapezius muscle is to move the shoulder blades, twist head and neck, stabilize the shoulders, shrug and support the arms.This muscle is also considered as an accessory breathing muscle.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • What are fun facts about the muscular system?

    Q: What are fun facts about the muscular system?

    A: The muscular system consists of approximately 700 muscles that belong to one of three distinct categories: skeletal, smooth or cardiac. Skeletal muscles are attached to the body's skeleton and assist it in moving. Smooth muscles are found in the internal organs and help maintain normal functions such as bladder control. Cardiac muscle is only found in the heart.
    See Full Answer
    Filed Under:
  • How much force can a human exert?

    Q: How much force can a human exert?

    A: Newton's second law of motion states that the force that an object exerts is equal to that object's mass times its acceleration. The amount of force that individuals can exert is directly proportional to their mass and the speed at which they are moving.
    See Full Answer
    Filed Under:
  • 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."
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • Which trunk muscle allows you to adduct your arms?

    Q: Which trunk muscle allows you to adduct your arms?

    A: The trunk muscles involved in arm adduction are the pectoralis major and pectoralis minor. Other muscles involved in arm adduction and transverse arm adduction are latissimus dorsi, pectoralis major, pectoralis minor, teres major, coracobrachialis and triceps brachii.
    See Full Answer
    Filed Under:
  • Which muscle bends the knee?

    Q: Which muscle bends the knee?

    A: The muscles that control the knees include the quadriceps, hamstrings and calf muscles. These muscles all work together to allow the knee to move freely in order to walk, run, kick and jump.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • What muscle group does the standing lateral raise primarily work?

    Q: What muscle group does the standing lateral raise primarily work?

    A: The standing lateral raise primarily works the lateral deltoid muscles, which are the muscles found on the sides of the shoulders. Synergists include the middle and lower trapezius and the anterior, or front, deltoid muscles.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:

Explore Human Anatomy