Chapter 7: Muscular System Flashcards
- set of tissues in the body with the ability to change shape
- produces body movements, maintains posture, and produces body heat
Muscular System
Functions of Muscular System
- Movement of the Body
- Maintenance of Posture
- Respiration
- Production of Body Heat
- Communication
- Constriction of Organs and Vessels
General Properties of Muscle Tissue
- Contractility
- Excitability
- Extensibility
- Elasticity
also called as striated muscle because transverse bands/striations can be seen in the muscle under the microscope
Skeletal Muscle
3 Connective Tissue Coverings of Muscle
- Epimysium
- Perimysium
- Endomysium
connective tissue sheath that surrounds each skeletal muscle
Epimysium
loose connective tissue that separates muscle fascicles from each other
Perimysium
loose connective tissue that surrounds each muscle fiber
Endomysium
Muscle Fiber Structures
- Sarcolemma
- Transverse tubules, or T tubules
- Sarcoplasmic Reticulum
- Sarcoplasm
- Myofibrils
cell membrane of the muscle fiber
Sarcolemma
many tubelike inward folds in the sarcolemma, located along the surface of the muscle fiber
Transverse tubules or T tubules
an enlarged portion of the smooth ER that is associated in T tubules
Sarcoplasmic Reticulum
cytoplasm of a muscle fiber
Sarcoplasm
bundles of protein filaments in the sarcoplasm
Myofibrils
basic structural and functional unit of the skeletal muscle and the smallest portion of a skeletal muscle capable of contracting
Sarcomeres