Label the components of skeletal muscle. 2 pts Actin Myofibril Muscle fascicle Muscle fiber Muscle (organ) Muscle fascicle Muscle fiber Muscle (organ) Myofibril Myosin Od Sarcomere Z-disk YOU . 2 Actin Z-disk Myosin Sarcomere
The correct answer and explanation is:
Here is the labeled image of the skeletal muscle components along with a 300-word explanation:
Labeled Components of Skeletal Muscle
- Muscle (Organ) – The entire skeletal muscle, composed of multiple fascicles, connective tissues, blood vessels, and nerves.
- Muscle Fascicle – A bundle of muscle fibers surrounded by connective tissue called perimysium.
- Muscle Fiber (Muscle Cell) – A long, multinucleated cell that contains multiple myofibrils. The muscle fiber is surrounded by the sarcolemma and contains sarcoplasm.
- Myofibril – The cylindrical structure inside the muscle fiber, composed of repeating units called sarcomeres, which are responsible for contraction.
- Sarcomere – The functional contractile unit of the muscle, made up of actin and myosin filaments.
- Z-Disk – The boundary of each sarcomere that anchors actin filaments. It helps maintain the structural integrity of the muscle.
- Actin – The thin filament in the sarcomere that interacts with myosin to generate force during contraction.
- Myosin – The thick filament that forms cross-bridges with actin to facilitate muscle contraction.
Explanation
Skeletal muscle is a highly organized tissue composed of repeating structural and functional units. The largest structure is the muscle organ, which consists of multiple muscle fascicles. Each fascicle contains several muscle fibers, which are long, cylindrical cells with multiple nuclei. Within each muscle fiber are numerous myofibrils, which house the essential contractile units known as sarcomeres.
A sarcomere is the fundamental unit of muscle contraction, extending from one Z-disk to another. Inside the sarcomere, actin (thin filaments) and myosin (thick filaments) interact to generate force. The myosin filaments pull on actin filaments, shortening the sarcomere and leading to muscle contraction.
This hierarchical organization allows skeletal muscle to generate precise and powerful movements efficiently.
Here is the labeled diagram of skeletal muscle structure. Let me know if you need any modifications or further explanations!
