Nervous Regulation Body Parts that react to things. Tools A B Regulation Is the control and coordination of all life activities Receptors Are specialized structures that are sensitive to changes in the external and internal environment Neurons Are nerve cells, The neuron is the basic unit of structure and function in the nervous system Effectors Are muscles or glands in which neurons are attached to The Neuron Neurons are used for the transmission of impulses from one part of the body to another Dendrites l Fibers that detect stimuli and generate an impulse toward the cyton Cyton Known as the cell body Axon l A fiber that transmits the impulse away from the cyton and towards the terminal branches Terminal Branches l The ends of axons that secrete neurotransmitters Synapse l The gap between the terminal branches of 1 neuron and the dendrites of another neuron. Neurotransmitters l Chemicals secreted by the terminal branches that aid in the transmission of an impulse across the synapse Hydra l Contains no brain or control center, so impulses travel in all directions across a nerve net