The correctorganisation of skeletal muscle is :a)muscle bundles→...
Each organised skeletal muscle in our body is made of a number of muscle bundles or fascicles held together by a common collagenous connective tissue layer called fascia. Each muscle bundle contains a number of muscle fibres. A characteristic feature of the muscle fibre is the presence of a large number of parallelly arranged filaments in the sarcoplasm called myofilaments or myofibrils. The portion of the myofibril between two successive ‘Z’ lines is considered as the functional unit of contraction and is called a sarcomere.
View all questions of this test
The correctorganisation of skeletal muscle is :a)muscle bundles→...
Correct Organization of Skeletal Muscle
The correct organization of skeletal muscle is represented by option 'B':
Fascicles
- Fascicles are bundles of muscle fibers (cells).
- They are surrounded by a connective tissue sheath called the perimysium.
- The arrangement of fascicles contributes to the muscle's strength and range of motion.
Muscle Fibers
- Muscle fibers, also known as muscle cells, are long, cylindrical cells that make up the fascicles.
- Each muscle fiber contains myofibrils, which are the contractile units of the muscle.
- Muscle fibers are surrounded by a plasma membrane called the sarcolemma.
Myofilaments
- Myofilaments are the smallest structures within muscle fibers, consisting of thick (myosin) and thin (actin) filaments.
- These filaments are responsible for muscle contraction through sliding filament theory.
- Myofilaments are organized into repeating units called sarcomeres.
Sarcomeres
- Sarcomeres are the basic functional units of muscle contraction.
- They are defined by the region between two Z-discs and contain both thick and thin filaments.
- The interaction of myosin and actin within sarcomeres leads to muscle shortening and force generation.
Summary
The hierarchy of skeletal muscle organization is crucial for understanding how muscles function effectively. The structure starts from large fascicles, moves down to individual muscle fibers, then to myofilaments, and finally to the microscopic sarcomeres. This organization allows for coordinated contractions necessary for movement and stability.
The correctorganisation of skeletal muscle is :a)muscle bundles→...
A)muscle bundles →→ myofibrils →→ muscle cells →→ sarcomere