synapse

• Synapses connect nuerones
• A nerve signal is transmitted by releasing a chemical called nuerotransmitters
• These diffuse across the synapse and then set off A NEW electrical SIGNAL in the NEXT NUERONE
• A nervous impluse is fast but is slowed when DIFFUSING across synapse
• Reflexes prevent injury
• Reflexes are AUTOMATIC and RAPID responses to STIMULI
• The passage of info in a reflex is called a reflex arc
• The nuerons go through spinal cord or an UNCONCIOUS PART OF THE BRAIN
• effector can be a gland or a muscle