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:
  • 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.
    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 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:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    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:
  • 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:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    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 scientific name of the thigh muscle?

    Q: What is the scientific name of the thigh muscle?

    A: The scientific name of the anterior thigh muscles is the quadriceps femoris. The other muscles in the thighs are called the adductors, which form the inner thigh, the hamstrings, which are at the back of the thighs, and the abductors, which are found on the outer thighs.
    See Full Answer
    Filed Under:
  • 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.
    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:
  • 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.
    See Full Answer
    Filed Under:
  • 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.
    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:
  • 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:
  • How do muscles work together to produce movement?

    Q: How do muscles work together to produce movement?

    A: According to Boundless.com, muscles are arranged in groupings of agonist, antagonist and synergists that produce and modulate movement. When a muscle contracts, it moves the bone and spreads the force of the contraction to avoid the tearing of fibers embedded in the periosteum of the bone known as tendons.
    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:

Explore Human Anatomy