Muscle Contraction
Across
- 1. an organ or cell able to respond to light, heat, or other external stimulus and transmit a signal to a sensory nerve.
- 4. adenosine triphosphate is a complex organic chemical that provides energy to drive many processes in living cell
- 6. the fine transpired tubular sheath which envelops the fibers of skeletal muscle cells
- 7. consist primarily of the protein myosin. Each actin has an active site that can bind to the head of a myosin molecule.
- 11. also known as adenosine pyrophosphate, is an important organic compound in metabolism and is essential to the flow of energy in living cells.
- 12. a compound which occurs throughout the nervous system, in which it functions as a neurotransmitter.
- 13. one of the segments into which a myofibril is divided
- 14. the space between neurons at a nerve impulse is transmitted by a neurotransmitter
- 16. it is a principal component of a person's internal environment—the extracellular fluid.
- 17. a neuron conducting impulses outwards from the brain or spinal cord
- 18. a protein that forms (together with myosin) the contractile filaments of muscle cells, and is also involved in motion in other types of cells
- 19. an elongated contractile cell that forms the muscles of the body
Down
- 2. a polymer of actin with tightly bound regulatory proteins troponin and tropomyosin
- 3. is a membrane-bound structure found within the muscle cells that is similar to the endoplasmic reticulum in other cells.
- 5. three regulatory proteins that is integral to muscle contraction in skeletal muscle and cardiac muscle but not smooth muscle
- 8. extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells
- 9. the local voltage change across the cell wall as a nerve impulse is transmitted.
- 10. a white metallic element that burns with a brilliant light
- 15. a fibrous protein that forms (together with actin) the contractile filaments of muscle cells and is also involved in motion in other types of cells.
- 20. the calcium is like a "key" which fits into the lock of a door (troponin)