Across
- 5. The thin filaments composed of this protein is one of two kinds of protein filaments in the myofibril
- 6. reticulum Membrane within the sarcoplasm of a muscle fiber form this and correspond to the endoplasmic reticulum of other types of cells
- 11. A protein that is synthesized in muscle cells and imparts the reddish-brown color of skeletal muscle tissue; it can combine loosely with oxygen just like hemoglobin
- 13. A muscle that opposes the action of another muscle; for the example of elbow flexion, triceps brachii is this certain muscle
- 15. The less movable end of the muscle; when a muscle contracts, its insertion is pulled toward this point on the muscle
- 16. cleft A small gap that separates the membrane of the neuron and the membrane of the muscle fiber
- 17. junction Synapse between a motor neuron and the muscle fiber that it controls
- 20. A movement that decreases the angle between two body parts, occurring at a joint
- 21. Near the region where the thick and thin filaments overlap each transverse tubule lies between two enlarged portions of the sarcoplasmic reticulum
- 22. The thick filaments composed of this protein is one of two kinds of protein filaments in the myofibril
- 23. The contractile response of a single muscle fiber to a single impulse is called this; It consists of a period of contraction, during which pulling force increases, followed by a period of relaxation, during which the pulling force declines
- 24. discs The opposing ends of cardiac muscle cells are connected by this type of structure; these are elaborate junctions between cardiac muscle cell membranes
- 25. A repeating pattern of units cause the striations of skeletal muscle within each muscle fiber
- 27. Threadlike structures that that lie parallel to one another in the sarcoplasm and play a fundamental role in muscle contraction
- 28. smooth muscle A type of smooth muscle which is composed of sheets of spindle-shaped cells in close contact with one another; it is the common type of smooth muscle which is found in the walls of hollow organs
- 29. A thin covering in which each muscle fiber within a fascicle lies within a layer of connective tissue
- 30. A layer of connective tissue that closely surrounds each skeletal muscle and what the fascia blends with
Down
- 1. tone It is a response to nervous stimulation that originates repeatedly from the spinal cord and stimulates only a few muscle fibers at a time
- 2. The more movable end of the muscle; when a muscle contracts, this point on the muscle is pulled toward the muscle’s origin
- 3. An increase in the number of motor units being activated during a contraction
- 4. A skeletal muscle fiber normally does not contract until this specific neurotransmitter stimulates it
- 7. A muscle that is responsible for a specific movement; for the example of elbow flexion, biceps brachii is this certain muscle
- 8. smooth muscle A type of major smooth muscle where the muscle cells are separate rather than organized into sheets
- 9. Small sections of muscle tissue that are separated from the perimysium and are bundles of skeletal muscle fibers
- 10. Dense connective tissue that separates an individual skeletal muscle from adjacent muscles and holds it in position
- 12. Chemicals that are released when neurons communicate with the cells that they control at synapses
- 14. The functional connection between a neuron and another cell
- 18. tubules A set of membranous channels that extend inwards as invaginations from the fiber’s membrane and passes all the way through the fiber
- 19. Broad fibrous sheets that connective tissue forms which may attach to bone, skin, or to the connective tissue of adjacent muscles
- 26. Other layers of connective tissue that extend inward from the epimysium