sarcomere is the functional unit of the skeletal muscle.
the functional unit of the skeletal muscle is the?
sarcomere
skeletal muscle includes skeletal muscle fibers, blood vessels, nerve fibers, and connective tissue. skeletal muscle is wrapped in epimysium, allowing structural integrity of the muscle despite contractions. the perimysium organizes the muscle fibers, which are encased in collagen and endomysium, into fascicles. each muscle fiber contains sarcolemma, sarcoplasm, and sarcoplasmic reticulum. the functional unit of a muscle fiber is called a sarcomere.





























each myofiber is composed of actin and myosin myofibrils repeated as a sarcomere.





























based on their contractile and metabolic phenotypes, skeletal muscle can be classified as slow-oxidative (type i) or fast-oxidative (type ii).





























section::::structure.:cardiac muscle.
striated muscle tissue
the electrical activity associated with muscle contraction are measured via electromyography (emg). emg is a common technique used in many disciplines within the exercise and rehab sciences. skeletal muscle has two physiological responses: relaxation and contraction. the mechanisms for which these responses occur generate electrical activity measured by emg. specifically, emg can measure the action potential of a skeletal muscle, which occurs from the hyperpolarization of the motor axons from nerve impulses sent to the muscle (1). emg is used in research for determining if the skeletal muscle of interest is being activated, the amount of force generated, and an indicator of muscle fatigue. the two types of emg are intra-muscular emg and the most common, surface emg. the emg signals are much greater when a skeletal muscle is contracting verses relaxing. however, for smaller and deeper skeletal muscles the emg signals are reduced and therefore are viewed as a less valued technique for measuring the activation. in research using emg, a maximal voluntary contraction (mvc) is commonly performed on the skeletal muscle of interest, to have reference data for the rest of the emg recordings during the main experimental testing for that same skeletal muscle.
skeletal muscle