Muscle Terms

2. synapse between a motor neuron and a skeletal muscle fiber
4. phenomenon in which a muscle fiber contracts when it is exposed to a stimulus of threshold strength
6. oxygen carrying pigment in Red Blood Cells
8. another protein that is part of the actin filament
11. continuous forceful muscular contraction without relaxation
12. the amount of oxygen required after physical excersize to convert accumulated lactic acid to glucose
13. a protein that forms filaments that slide between filaments of the protein myosin, contracting muscle fibers
15. a pigmented protein in muscle that carries oxygen
16. chemical that an axon end secretes on an effector or another neuron
19. a protein that, with actin, contracts muscle fibers
21. layers of fibrous tissue, separate individual skeletal muscles from adjacent muscles and hold it in place
26. specialized portion of muscle fiber membrane at an effector
27. protein that is part of the actin filament
28. stimulus stimulation level that must be exceeded to elicit a nerve impulse or a muscle contraction
29. membranous channel that extends inward from a muscle fiber membrane
30. time between application of a stimulus and the beginning of a response in a muscle fiber
31. a muscle biochemical that stores energy

1. membranous network of channels and tubules of a muscle fiber, corresponding to the endoplasmic reticulum of other cells
3. a sheet of connective tissue that attaches muscles
5. structural and functional unit of a myofibril segment that extends from one zline to the next
7. a response to nerve impulses that originate repeatedly from the spinal cord and stimulate muscle fibers.
9. a group of enzymes that catalyze the hydrolysis of a phosphate bond in adenosine triphosphate (ATP) to form adenosine diphosphate (ADP)
10. a neuron that transmits impulses from the central nervous system to an effector
14. increase in number of motor units activated as stimulation intensity increases
17. a brief contraction of a muscle fiber followed by a relaxation
18. increased force of contraction by a skeltal muscle fiber when a twitch occurs before the previous twitch relaxes
20. A neuron that transmits impulses from the central nervous system to an affector
22. an enzyme that catalyzes the breakdown of acetylcholine
23. describes the process used by muscles to contract. It is a cycle of repetitive events that causes actin and myosin myofilaments to slide over each other, contracting the sarcomere and generating tension in the muscle.
24. Contractile fibers in muscle cells
25. a recording of a muscle contraction