Across
- 2. the level of stimulation required to trigger a neural impulse
- 7. a neurotransmitter's reabsorption of a sending neuron
- 12. the neuron extension that passes messages through its branches to other neurons
- 13. cells in the nervous system that support and protect the neurons; play a roll in thinking and memory
- 17. the removal of a neurotransmitter by breaking it apart by enzymes
- 21. a molecule that increases a neurotransmitters action
- 22. is located in the front part of the neck; regulates metabolism, helps with blood pressure, heart rate, digestion, muscle tone, and reproductive functions
- 23. the basic building block of the nervous system
- 24. neurons that carry outgoing information from the brain and spinal cord to the muscles and glands
- 25. pair of glands that sit above the kidneys; help the body in times of stress
- 29. the part of neuron that contains the nucleus; the cells life support
- 32. hormones secreted linked with pain control and pleasure
- 33. a neural impulse; a brief electrical charge that travels down the axon
- 34. neurons that carry incoming information from the body's tissues to the brain and spinal cord
- 36. chemical messengers that cross the synaptic gaps between neurons
- 37. a brief period of rest after the neuron has fired
- 38. the part of the peripheral nervous system that controls the body's glands and muscles for internal organs
Down
- 1. the division of the autonomic nervous system that conserves the body's energy; flight
- 3. the space between the axon tip of a sending neuron, and the dendrite or cell body of a receiving neuron
- 4. the sensory and motor neurons that connect the CNS to the rest of the body
- 5. chemical messengers of the endocrine system
- 6. known as the most important gland; has to do with growth and development
- 8. at the resting state there are more negatively charges ions inside the cell
- 9. neurons within the brain and spinal cord that communicate internally and process information between the sensory inputs and motor outputs
- 10. a layer of fat that protects the axon body, and can speed up neural impulses
- 11. neurotransmitters that send signals to calm down the cell; decrease likelihood of an action potential
- 14. neurotransmitter that sends signals to stimulate the cell; increase likelihood of an action potential
- 15. the brain and spinal cord
- 16. the division of the peripheral nervous system that controls the body's skeletal muscles
- 18. are caused by the over or under production of hormones
- 19. the division of the autonomic nervous system that used the body's energy; fight
- 20. bundled axons that form neural cables connecting the CNS with muscles, glands, and sense organs
- 26. the body's chemical communication system; a set of glands that secretes hormones into the bloodstream
- 27. the body's speedy, electrochemical communication network, consisting of all the nerve cells of the peripheral and central nervous system
- 28. when the cell channels open up, allowing the positively charged ions to rush in and the negatively charged ions to rush in
- 30. neurons branches that receive and integrate messages, conducting impulses down toward the cell body
- 31. a molecule that blocks neurotransmitter's action
- 35. the removal of a neurotransmitter by waiting for it to float away from the cell