Chapter 11 and 12 matching game Tools A B Synapse the gap between the terminal bramches of 1 neuron and the dendrites of another neuron Receptors specialized structures that are senistive to changes in the external and internal environment Neuron the basic unit of structure and function in the nervous system Effectors are muscles and glands in which the neurons are attached to Dendrites fibers that detect stimuli and generate an impulse toward the cyton Cyton known as the cell body contains the nucleus of the neuron Axon a fiber that transmits the impulse away from the cyton and towards the terminal branches Terminal Branches The ends of axons that secret neurotranmitters Neurotransmitters Chemicals secreted by the terminal branches that aid in the transmission of an impulse across the synapse Hydra contains no brain or central control, so impulses travel in all directions of a nerve net