Biology Crossword

2. arc An inborn response to a stimulus and is rapid, automatic and beneficial
3. nervous system Associated with skeletal muscle to provide voluntary control of body movements (part of PNS)
7. nervous system The nerves and ganglia on the outside of the CNS
9. conduction Jumping of action potentials from one Node of Ranvier to the next due to the electrical insulation of myelin
11. Detects stimulus (one form of energy) and converts this electrical energy to send the information as an electrical impulse to the central nervous system via neurones
12. net The most simple type of nervous system found in simple organisms such as hydras, jellyfish and sea anemones.
14. Stimulates the nervous system - Increase number of action potentials.
15. Inhibit the nervous system - decreased number of action potentials.

1. When the nerve impulse is initiated the action potential is created
3. A detectable change in the external or internal environment of an organism
4. Receives electrical impulses from the CNS and brings about a response
5. spinal cord A long, thin, tubular bundle of nervous tissue and support cells that extends from the brain.
6. cell A cell which can change its resting potential
8. Neurones are separated by gaps called
10. nervous system Provides unconscious control of functions of internal organs, e.g. heartbeat, digestion (part of PNS)
13. potential When no impulse is being sent the inside of the cell has a negative electrical charge compared to the outside, this is known as the