2 Jobs of the Nervous System: Receiving InformationYou are aware of what is happening around youResponding to InformationYour body often reacts to an actionMaintaining HomeostasisYour nervous system tells your body how to respond when it receives information
3 The NeuronNeuron: the cells that carry information through your nervous systemNerve Impulse: the message that a neuron carries
4 Structure of a NeuronDendrite: an extension of a cell body at carries impulses toward a cell bodyAxon: carries impulses away from a cell bodyNerve: a bundle of nerve fibers
5 Structure of a Neuron 1. Dendrites 3. Cell Body 2. Nucleus 4. Axon 5. Axon Tips
6 Kinds of NeuronsSensory Neuron: picks up stimuli from the internal or external environment on converts each stimulus into a nerve impulseInterneuron: a neuron that carries nerve impulses from one neuron to anotherMotor Neuron: sends an impulse to a muscle – the muscle contracts in response
7 Path of a Nerve Impulse Sensory Neuron (1&2) Nerve receptors pick up stimuli, the receptors then trigger nerve impulses in sensory neurons
8 Path of a Nerve Impulse Interneuron (3 & 4) Nerve impulse is passed to the brain. Your brain decides what you need to do
9 Path of a Nerve Impulse Motor Neuron (5 & 6) Impulses pass along motor neurons to muscles. The muscles carry out the response.
10 How a Nerve Impulse Travels 120 meters per secondAssume distance is one metertotal distance = 2 meters120 m = 2 m solve using1 sec x ratios0.017 seconds meter
11 Central Nervous System Two parts of the CNS:Brain and Spinal CordWhat does the CNS do?It is the control center of the body
12 Peripheral Nervous System What is the PNS and what does it do?It is a network of nerves that branch out from the central nervous system and connect it to the rest of the bodyWhat is the Somatic Nervous System?This controls voluntary actions like writingWhat is the Autonomic Nervous System?This controls involuntary actions like breathing
13 What is a reflex?An automatic response that occurs very rapidly and without conscious control
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