Anatomy Muscles Crossword

1. Model of muscle contraction where sarcomeres shorten due to overlapping of actin and myosin filaments.
5. Oxygen-binding protein in red blood cells.
8. Small gap between the neuron and muscle fiber membranes at a synapse.
10. Thin connective tissue layer that surrounds individual muscle fibers within each fascicle.
11. Functional junction between a neuron and another cell for signal transmission.
12. Repeating structural units within skeletal muscle fibers.
13. Single, rapid contraction response of a muscle fiber to a stimulus.
14. Connective tissue that divides muscle tissue into bundles called fascicles.
16. Outer layer of connective tissue that closely surrounds each skeletal muscle.
17. Thin protein filaments in myofibrils involved in muscle contraction.
19. Oxygen-binding protein synthesized in muscle cells, enhancing oxygen availability.
22. Protruding parts of myosin filaments that bind and pull on actin during contraction.
23. Membranous channels extending into the muscle fiber, carrying extracellular fluid to support muscle contraction.
24. Specialized smooth endoplasmic reticulum that surrounds each myofibril, storing and releasing calcium ions.

2. Primary muscle responsible for a specific movement.
3. Movement that increases the angle between bones at a joint.
4. Enlarged sections of the sarcoplasmic reticulum near T-tubules.
6. Muscle that opposes the action of the agonist.
7. Muscles that assist the agonist by contributing to the movement.
9. involuntary muscle tissue found in the heart.
12. Voluntary muscle attached to bones, controlled consciously.
15. Involuntary muscle tissue without striations, found in walls of internal organs.
18. Chemical messengers released by neurons to communicate with target cells.
20. Movement that decreases the angle between bones at a joint.
21. Dense connective tissue that surrounds and separates individual skeletal muscles, anchoring them in place and providing structural support.