Vocabulary Chapter 9 & 10: Muscles and Muscle Tissue

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