Across
- 3. Neurons found within the central nervous system. They process and integrate incoming sensory information, and relay outgoing motor information. They send information BETWEEN sensory neurons and motor neurons.
- 5. A reaction or change in an organism, either physiological or behavioural, as a result of a stimulus.
- 9. Nervous System (PNS): All the nerves that do not form the central nervous system (brain and spinal cord): sensory receptors, sensory neurons and motor neurons.
- 11. neurons: Sensory neurons gather information from the sensory receptors (senses) and send this sensory information as impulses TOWARDS the central nervous system.
- 12. Sheath: Around the axon of a neuron, an insulating coat of cell membrane.
- 13. Cord: Part of the central nervous system that is below the brain and enclosed within vertebra.
- 15. A rapid, unconscious reaction to a stimulus, mediated by the spinal cord or lower brain.
- 17. arc: A rapid response which automatically follows a stimulus, involving only a small number of neurons. It is composed of a receptor cell, a sensory neuron, an interneuron (relay neuron) in the spinal cord, and a motor neuron, which carries the message to the effector.
- 18. The enlarged part of the CNS which is encased within the cranium of the skull, where information is processed and integrated.
- 19. nervous system: The brain and the spinal cord
- 21. Nervous System: Division of the peripheral nervous system (PNS) that contains all sensory neurons, and motor neurons to skeletal muscles.
- 22. A molecule that is released from the synaptic terminal of a neuron at a synapse, diffuses across the synaptic cleft, and binds to the cell on the other side, triggering a response.
- 23. Junction between two neurons or a junction between neurons and receptor or effector cells.
Down
- 1. Sacs in the axon terminal that contain neurotransmitters, able to fuse with the membrane of the axon terminal in order to release their contents into the synaptic cleft.
- 2. neurons: Motor neurons send information AWAY from the central nervous system to effector muscles, glands and other organs (effectors).
- 4. Many individual neurons group together into a single structure.
- 6. Any change in the environment of an organism that is detected by a receptor and provokes a response in the organism
- 7. Long, threadlike part of a neuron which conducts impulses AWAY from the soma (cell body).
- 8. terminals: The many fibres that the terminal end of an axon branches into. The end of the neuron where the electrical nerve impulse finishes prior to the synapse.
- 10. A cell or group of cells that receives stimuli
- 11. (cell body): The cell body of the neuron that processes input from the dendrites; contains the nucleus.
- 14. A nerve cell; an elongated branched cell that carries electrical messages, called nerve impulses, from one part of the body to another at high speed
- 16. Short, branching terminals that receive nerve impulses from other neurons or sensory receptors, and relay the impulse TOWARD the cell body.
- 20. nervous system: Branch of the peripheral nervous system which is involuntary and regulates internal processes without our awareness. Consists of the sympathetic and parasympathetic