Across
- 3. a whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs
- 5. neuron: Sensory neurons that carry nerve impulses from sensory stimuli towards the central nervous system and brain
- 7. neurotransmitter receptors: receive signals that trigger an electrical signal, by regulating the activity of ion channels.
- 9. a sensory receptor which receives stimuli from within the body, especially one that responds to position and movement.
- 12. nervous system: Controls the activities of the body. In vertebrates, comprises the brain and spinal cord.
- 13. nervous system: the nervous system outside the brain and spinal cord
- 16. a structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber.
- 18. nervous system: Controls bodily functions not consciously directed, such as breathing, the heartbeat, and digestive processes
- 19. a short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body.
- 20. membrane: specialized area of membrane of the axon terminal that faces the plasma membrane of the neuron or muscle fiber
- 23. bodies: the large granular body found in neurons.
- 24. neuron: motor neurons that carry neural impulses away from the central nervous system towards muscles to cause movement
- 25. long threadlike part of a nerve cell along which impulses are conducted from the cell body to other cells
- 26. of ranvier: a gap in the myelin sheath of a nerve, between adjacent Schwann cells.
Down
- 1. a chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse
- 2. body: nucleus-containing central part of a neuron
- 4. he site of transmission of electric nerve impulses between two nerve cells or between a neuron and a gland or muscle cell
- 6. a thing or event that evokes a specific functional reaction in an organ or tissue.
- 8. membrane: receives a signal from the presynaptic cell
- 10. cells: any of the cells in the peripheral nervous system that produce the myelin sheath around neuronal axons
- 11. a neuron which transmits impulses between other neurons, especially as part of a reflex arc
- 14. terminal: typically the sites where synapses with other neurons are found, and neurotransmitters are stored there to communicate with other neurons
- 15. nervous system: known as the voluntary nervous system. Consists of neurons that are associated with skeletal or striated muscle fibers and influence voluntary movements of the body.
- 17. feel that hold nerve cells in place and help them work the way they should
- 21. the fundamental units of the brain and nervous system. responsible for receiving sensory input from external world, sending motor commands to our muscles, transforming and relaying electrical signals.
- 22. sheath: insulating layer that forms around nerves, including those in brain and spinal cord. Allows electrical impulses to transmit quickly and efficiently along nerve cells.