| A | B |
|---|
| dendrites | short, threadlike extensions of the cell body of a neuron that conduct nerve impulses toward the cell body |
| axon | a long, specialized process of a neuron that carries nerve impulses away from the cell body to the next neuron |
| myelin | a laminated lipid sheath covering an axon |
| node of ranvier | regular gaps in a myelin sheath around a nerve fiber |
| action potential | the spreadof an impulse along the axon following depolarzation of the plasma membrane; called a nerve impulse |
| synaptic cleft | the narrow space vetween the treminal ending of a neuron and the receptor site of the postsynapic cell. |
| neurotransmitters | chemical messengers synthesized in neurons that are released into the synaptic cleft when nerve impulse reaches the end bulb |
| Dopamine | a neurotransmitter that modulates activity of adrenal neurons and motor activities; also make you feel good |
| Multiple Sclerosis | a progressive demyelination of neurons in the central |
