Across
- 3. Collagen fibers that link the skeletal muscle to bone.
- 8. During strength training, it is the body’s adaptation that leads to muscular performance improvements as reflected by the body’s increased strength.
- 11. Type of muscle fiber that is red in appearance, aerobic, small, fatigue resistant, and has a slow speed of contraction.
- 14. Ending of a motor nerve at a muscle fiber that delivers neural impulses and in turn activates the fiber.
- 15. A connective tissue sheath that surrounds each muscle fiber or cell.
- 16. The thin myofilament that makes up the sarcomere.
- 19. A procedure during which a small piece of tissue is cut and removed from the muscle and then analyzed under a microscope.
- 20. A muscle’s attachment that is closer to the center of the body; also known as its proximal attachment.
- 22. A cylinder-shaped cell that makes up skeletal muscle.
- 23. An impulse of a certain magnitude is required to cause the innervated fiber to contract.
- 24. system Nerve cells and fibers that lie outside the central nervous system; connects the central nervous system to the rest of the body.
- 25. The capacity to activate motor units simultaneously.
Down
- 1. Muscle that is attached to bone; its contraction is responsible for supporting and moving the skeleton, and it is under voluntary control.
- 2. Proteins that make up the sarcomere (i.e., actin and myosin).
- 4. Individual threadlike fibers that run lengthwise and parallel to one another within a muscle fiber and contain contractile units, or sarcomeres.
- 5. deficit The difference between assisted and voluntarily generated maximal force during muscle contraction.
- 6. Contractile unit of a skeletal muscle that is organized within a myofibril in series (i.e., attached with other sarcomeres end to end).
- 7. A muscle or group of muscles opposing the action.
- 9. The capacity to activate various muscles or muscle groups simultaneously to produce action.
- 10. Steadies the joint closer to the body axis so that the desired action can occur.
- 12. Type of muscle fiber that is white in appearance, anaerobic, large, fatigable, and has high contraction speed.
- 13. The phenomenon of muscle contraction, during which the sliding of the actin filaments over the myosin filaments causes shortening of the muscle to create movement.
- 17. Forms the walls of blood vessels and body organs; under the control of the autonomic nervous system.
- 18. system The brain and spinal cord; regarded as the body’s control center.
- 21. The muscle of the heart that has characteristics of both smooth and skeletal muscle and is under involuntary control.