Across
- 1. corkscrew-shaped protein that composes collagen fibrils
- 4. the oxygen required by the body to metabolize lactic acid and replenish glycogen, creatine phosphate, and ATP stores after exercise
- 5. the breakdown of ATP in muscle produces this byproduct, which is why we shiver when we are cold
- 9. highly responsive to stimulation from the nervous system
- 10. able to rebound back to original shape and length
- 11. an acute involuntary muscle contraction that lasts for several minutes; palpable as a knot
- 13. inability to contract forcefully after prolonged activity
- 14. a broad, flat sheet of organized connective tissue that attaches a muscle to bone
- 15. muscles work together with ligaments and joint capsules to stabilize _______
- 17. the organized fibrous connective tissue that makes up tendons is composed of ________ packed collagen fibers
- 18. a nerve cell that stimulates multiple muscle fibers in a motor unit
- 19. a muscle contraction in which there is an increase in tension, but no change in length
Down
- 2. capable of forcefully shortening
- 3. an isotonic contraction in which the muscle produces tension while it is lengthening
- 6. the minimum stimulus required to produce a response
- 7. the type of contraction responsible for maintaining posture
- 8. communicating chemicals released from a neuron
- 10. able to lengthen
- 12. the region of a muscle fiber that is highly sensitive to neurotransmitters
- 16. type of fibrous connective tissue that makes up fascia