A neuron firing is like a toilet flushing 1.Like a Neuron, a toilet has a resting potential. The toilet is “charged” when there is water in the tank and it is capable of being flushed.
Neuron firing like a Toilet 2. Like a Neuron, a toilet has an action potential. When you flush, an “impulse” is sent down the sewer pipe.
Neuron firing like a Toilet 1.Like a neuron, a toilet has a refractory period. There is a short delay after flushing when the toilet cannot be flushed again because the tank is being refilled 2.Like a Neuron, a toilet operates on the all-or-nothing principle – it always flushes with the same intensity, no matter how much force you apply to the handle
Communication Between Neurons Module 7: Neural and Hormonal Systems
Synapse The electrical message from the dendrite travels down the axon to the terminal buttons. Here, it changes into a chemical message to be transferred to the next neuron. The tiny, fluid filled gap between the axon terminal of one neuron and the dendrite of another neuron is called the synapse.
Acetylcholine (ACh) Enables muscle action, learning, and memory Undersupply, as ACh- producing neurons deteriorate, marks Alzheimer’s disease
Dopamine Influences movement, learning, attention, and emotion Helps control the brains reward and pleasure center! Excessive dopamine receptor activity is linked to schizophrenia; a lack of dopamine produces the tremors and lack of mobility of Parkinson’s disease
Serotonin Affects mood, hunger, sleep, and arousal Undersupply is linked to depression; Prozac and other anti-depressants raise serotonin levels
Norepinephrine Helps to control alertness and arousal Undersupply can depress mood
Endorphins Natural opiates that are released in response to pain and vigorous exercise Endorphins
Touch Neuron to review http://www.childrenshospital.org/research/ _neuron/index.html
Peripheral Nervous System (PNS) The sensory and motor nerves that connect the central nervous system to the rest of the body Peripheral means “outer region” The system is subdivided into the somatic and autonomic nervous systems.
Autonomic Nervous System The division of the peripheral nervous system that controls the glands and muscles of the internal organs Monitors the autonomic functions Controls breathing, blood pressure, and digestive processes Divided into the sympathetic and parasympathetic nervous systems