Across
- 1. unit recruitment – The process by which the nervous system activates specific muscle fibers based on force needs.
- 3. 1 fibers – Also known as slow oxidative fibers; they rely on aerobic respiration.
- 5. – A protein that stores oxygen in muscle fibers and gives red fibers their color.
- 8. glycolysis – A fast energy-generating process without oxygen, used by fast glycolytic fibers.
- 9. twitch – Muscle fibers that contract quickly and powerfully but fatigue rapidly.
Down
- 1. – Organelles responsible for aerobic ATP production in muscle cells.
- 2. 2a fibers – Fast oxidative fibers that combine endurance and speed; also called hybrid fibers.
- 4. 2x fibers – Fast glycolytic fibers that use anaerobic glycolysis and produce strong, quick contractions.
- 6. – The enlargement of muscle fibers due to strength or resistance training.
- 7. twitch – Muscle fibers that contract slowly, are fatigue-resistant, and ideal for endurance.