Muscular System Remembering Project

6. A sheath of stringy connective tissue that surrounds every part of your body
7. a bundle of skeletal muscle fibers running parallel to each other
9. A wispy layer of areolar connective tissue that ensheaths each individual muscle fiber
10. A basic rod-like organelle of a muscle cell
12. Attachment site that doesn't move during contraction
13. Muscle that provides the primary force driving the action
16. The fine, delicate, extensible membrane surrounding each muscle fiber
17. Attachment site that does move when the muscle contracts
20. Dense connective tissue that surrounds the entire muscle tissue
22. Fundamental unit of muscle tissue, a multinucleated syncytium containing myofilaments that contract to enable muscle movement
23. A myofilament of the one of the two types making up myofibrils, composed of actin
25. Extension of the cell membrane that penetrates into the center of skeletal and cardiac muscle cells

1. Cytoplasm of a muscle fibre
2. A specialized form of the endoplasmic reticulum of muscle cells, dedicated to calcium ion (Ca2+) handling, necessary for muscle contraction and relaxation
3. Continuous layer of collagenous connective tissue that separates the skeletal muscle tissue into muscle fascicles
4. The muscle that is contracting
5. The main contractile unit of muscle fiber in the skeletal muscle
8. Membrane-bound cell organelles
11. Tube through which the blood circulates in the body
14. Controls and regulates the activities of the cell, contains genetic material
15. One of two protein structures that is responsible for muscle contraction, myosin
18. Assists the agonist muscle or “primary mover” for a specific action at a joint
19. The muscle that is relaxing or lengthening
21. A bundle of fibers that receives and sends messages between the body and the brain
23. Tough, fibrous, cord-like tissue that connects muscle to bone or another structure
24. A skeletal muscle substructure responsible for the regulation of excitation-contraction coupling