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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  • 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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  • 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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  • 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.
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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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  • Why can't I sit cross-legged?

    Q: Why can't I sit cross-legged?

    A: According to Yoga Journal, sitting cross-legged requires flexibility in the hip joints, back and inner thighs, and pelvis. These muscles are all very strong and can take some coaxing before stretching and relaxing enough for this to be a comfortable seated position.
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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 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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  • Where are the quadriceps located?

    Q: Where are the quadriceps located?

    A: The quadriceps are a group of four muscles located at the front and sides of the thighs. These muscles originate from the femur bone and run down to the patella or kneecap.
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  • 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.
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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 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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  • 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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  • What is the tendon behind the knee called?

    Q: What is the tendon behind the knee called?

    A: According to the Cascade Wellness Clinic, the popliteal tendon is situated behind the knee. The tendon connects the popliteus muscle to the femur bone just above the knee.
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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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  • 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 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 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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  • 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.
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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 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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  • 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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