Psya01 lecture 8: neurons and the nervous system. Watch beginning of lecture for mtuner information. Central nervous system: where most big decisions are made. When you are relaxed, the body is in the. Somatic system: conscious will parasympathetic mode: body works on maintenance on tissue and food. No need for action, so body maintenance is easier. Flight: forgets about maintenance, action, transmits oxygen to muscles, everything is going to the muscles, stress tells you there is a problem and you need to do something. Neurons: pass signals on from neuron to neuron, communications go in a straight line or in other directions. Can only send a message that says to get excited or not. Sensory neurons pick up the information to the brain about the heat. Tells the brain to contract: neurons can also tell nerves to fire or inhibit them. Carrying a hot dish at a social gathering. Not wanting to drop it even though it is hot.