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Across 3. Cytoplasm of a muscle fiber that contains organelles, including myofibrils 4. A red pigment that stores oxygen for muscle contraction 7. Flexes, medially rotates, and adducts arm 10. Extends thigh 12. Flexes arm and forearm, supinates forearm 13. Flexes forearm 15. Extends arm and forearm 16. muscle in cheek area; "trumpeter's muscle"; also used in swallowing 19. Flexes and rotates leg medially and extends thigh 20. Closes the jaw 22. The smooth ER of a muscle fiber that stores calcium (Ca++) 25. A section of thick and thin filaments between Z lines 29. Depresses scapula and pulls it forward; elevates arm above horizontal 34. Flexes head and rotates head 37. A bundle of myofilaments that contracts 38. Depress the rib cage during a forced expiration 39. Extends head and adducts scapula 40. Helps to close the jaw 41. Muscle involved in smiling

Down 1. Plasma membrane of a muscle fiber that forms T tubules 2. Flexes thigh 5. Muscle lying over the frontal bone, raises the eyebrows and wrinkles the brow 6. Extends, adducts, medially rotates arm 8. Extends leg, steadies hip joint, and assists in thigh flexion 9. Adducts thigh 11. Dorsiflexion and inversion of foot 14. muscles between the ribs, elevate the rib cage when breathing 17. Plantar flexion and eversion of foot 18. A ring of muscle that closes or blinks the eye; responsible for "crow's feet" at the eye corners 21. A ring of muscle around the mouth, used to pucker the lips 23. Increase in the size of an organ, usually by an increase in the size of its cells 24. Abducts thigh 26. Angular and rotational movements of arm 27. Abducts arm to horizontal 28. Thick and thin filaments whose structure and functions account for muscle striations and contractions 30. A neurotransmitter that signals the muscle cell to contract 31. Flexes leg; flexes, abducts, and laterally rotates thigh 32. Flexes leg; plantar flexion and eversion of foot 33. Dome-shaped muscle used during quiet breathing; separates thoracic and abdominal cavities 35. Extension of the sarcolemma that extends into the muscle fiber and conveys nerve signals that cause Ca++ to be released from the sarcoplasmic reticulum into the sarcoplasm 36. A polysaccharide that stores energy for muscle contraction