PHYSIOLOGY
MUSCLE STRUCTURE FUNCTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
myofibrils
|
|
|
sarcolemma
|
|
|
sarcomere
|
|
|
None of the above
|
Detailed explanation-1: -The sarcomere is the fundamental contractile unit of the myofibril.
Detailed explanation-2: -Structural and Functional Organization of Skeletal Muscle Myofibrils constitute the contractile system, which consists of four complex proteins: myosin, actin, tropomyosin, and troponin. These four proteins are arranged into a functional unit called a sarcomere (see Fig.
Detailed explanation-3: -The contractile proteins (actin and myosin) of muscles undergo the phases of contraction and relaxation to ensure the movement of the respective body parts.
Detailed explanation-4: -The myofibrils are made up of thick and thin myofilaments, which help give the muscle its striped appearance. The thick filaments are composed of myosin, and the thin filaments are predominantly actin, along with two other muscle proteins, tropomyosin and troponin.