Across
- 1. the event that makes a nerve cell likely to transmit an impulse
- 5. the nerve cells that are activated by sensory input from the environment
- 7. when a muscle shortens and does work using energy in the form of ATP (energy). It is the result of special proteins moving between each other
- 11. a nerve cell forming part of a pathway along which impulses pass from the brain or spinal cord to a muscle or gland
- 13. transfers signals to other cells and organs
- 14. the thin protein that slides during contraction
- 15. fibres in the muscle made up of two proteins which allow skeletal muscle to move
Down
- 2. the thick protein that releases calcium to pull the actin filaments to contract
- 3. receive signals from other cells
- 4. muscles that work as a pair to carry out opposite actions
- 6. bone producing cells that arrange themselves in rings around blood vessels
- 8. a flexible material made of protein that initially forms the skeleton but is mostly replaced by bone. It is found protecting the ends of bones from friction in joints
- 9. the area of which one neuron communicates with another
- 10. bone destroying cells that remove bone from where it is not needed so allowing bones to respond to the forces exerted on them
- 12. when a muscle is not contracting