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A&P Ch.6
Skeletal Muscle System
| Question | Answer |
|---|---|
| insertion | Moving end of a muscle attachment |
| origin | The fixed (non moving) muscle attachment |
| What connective element of skeletal muscle is described as the tenoperiosteal junction? | The fibrous connective tissue between the tenoperiosteum and tendon |
| What is the action of gracilis? | Flexion of the leg at the knee joint , adduction of thigh at the hip joint |
| What is the function of a tendon? | connect muscle to bone |
| The myofilament bonding of a muscle contraction can only occur in the presence of what element? | Calcium |
| What is the atomic name for skeletal muscle cell? | Myofiber |
| What facial layer surrounds each skeletal muscle fiber. | Endomysium |
| What are the actions of bicep fermoris? | Flexion of the leg at the knee joint |
| What change occurs in the muscle during a concentric contraction? | muscle shortens |
| The perimysium is a layer of fascia that surrounds a group of muscle fibers dividing the muscle into several compartments called..... | fascicles |
| What is the anatomic name for a broad sheet of connective tissue that serves as the attachment point for several muscles in the torso or thigh? | Aponeurosis |
| The functions of the muscular system are to maintain posture, create movement, | stabilize joints and generate heat |
| Which microscopic fiber in muscle is formed by the end to end arrangement of sarcomeres? | Myofibril |
| A skeletal muscle fiber or muscle cell, is made up of smaller fibers called | Myofibrils (Skeletal muscle fiber, made up of smaller fibers) |
| The sarcomere of a skeletal muscle is a small unit of bundled : | Actin and Myosin |
| What portion of the muscle cell is the actual contractile unit? | Sarcomere |
| What fascial layer forms the outer envelope of the muscle and anchors it to the hypodermis? | Epimysium |
| The physiologic principle that explains how a muscle contracts? | Sliding filament mechanism |
| common action of pectinous..... | adduction of the thigh at the hip joint |
| common action of the semitendinosis? | Extension of the thigh at the hip joint, flexion of leg at the knee joint |
| Which of these connective tissue components is classified organized fibrous? | Tendon |
| Which of the following has an insertion at the IT band only? | TFL |
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Chermilofit