Across
- 5. A rigid bar that moves on a fixed point, a fulcrum, when a force is applied to it.
- 6. Are evident along the length of each myofibril and are a dark striation.
- 7. The point or mode of attachment of a skeletal muscle to the bone or other body part that moves when muscle is contracted.
- 8. Is a protein that composes thick filaments.
- 11. A plasma membrane that each skeletal muscle fiber is arranged under.
- 16. The response of a muscle to a single brief stimulus (2 Words).
- 19. Thick filaments that are composed primarily of the protein myosin.
- 20. A fine sheath of connective tissue that surrounds each individual muscle fiber.
- 23. A globular head of a myosin molecule that projects from a myosin filament in muscle.
- 24. A contraction in which muscle does not shorten because the load is too heavy, but its internal tension increases (2 words).
- 25. A dark line that vertically bisects each H zone.
- 26. Refers to the activation of myosin's cross bridges to generate a force. Ends when the cross bridges become inactive and the generated tension declines.
- 27. A layer of fibrous connective tissue that surrounds each fascicle.
- 30. Keeps the muscle healthy and ready to act, and is low levels of contractile activity in relaxed muscles (2 Words).
- 31. Appears in each A band's midsection and is a lighter stripe.
- 33. The opposing force exerted on the muscle by the weight of the object to be moved.
- 34. Resembles a bundle of sticks and are groups of endomysium-wrapped muscle fibers.
- 35. Is a protein that composes thin filaments.
- 36. A major protein located inside a thin filament that is a three-polypeptide complex.
Down
- 1. Appears in each I band's midsection and appears to be a darker area.
- 2. Muscle that bears the major responsibility for effecting a particular movement. Is a prime mover.
- 3. The muscle's insertion moves towards this immovable or less movable bone.
- 4. Contains unusually large amounts of glycosomes and myoglobin, and is similar to the cytoplasm of other cells.
- 9. An "overcoat" of dense irregular connective tissue that covers the whole muscle.
- 10. The force exerted by a contracting muscle on some object.
- 12. Muscle that opposes or reverses the action of another muscle.
- 13. Skeletal muscle under strict control strict nervous control(2 Words).
- 14. A contraction in which muscle tension remains constant at a given joint angle and load, and the muscle shortens.
- 15. Is the decline in ability of a muscle to generate force (2 Words).
- 17. A rod-shaped protein that spirals about the actin core to help stiffen a thin filament.
- 18. Are a skeletal and smooth muscle cell (2 Words).
- 21. A motor neuron and all the muscle cells it stimulates (2 words).
- 22. Extensions of the sarcolemma that penetrate into the centre of the skeletal and cardiac muscle cells (2 Words).
- 28. Are evident along the length of each myofibril and are a light striation.
- 29. A red pigment that stores oxygen and is similar to hemoglobin.
- 32. Is the region of a myofibril located between two successive Z discs. Literally means "muscle segment."