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Transcript
Activator Cell phones never work in horror movies. Imagine an attempt to reduce cell phone use in class by the teacher locking the door and pulling out all sorts of torture devices.That would be kind a crazy. And then the teacher walks right up to you and asks… Which organs do you think are absolutely necessary in order for you to keep living? The Nervous System Wait… WHAT IS HE DOING WITH THAT MOUSE TRAP! Today’s class will be Nerve Wracking The nervous system is used by your body for a lot of things. But before we can get to the system, we need to first understand the individual unit. The neuron. Pg 962 Ask me about the synapse Copy these notes There are three kinds of neurons: Sensory neurons, interneurons, and motor neurons. The sensory neuron creates an impulse that travels to an interneuron in the spine or brain. The interneuron then sends an impulse to a motor neuron. The motor neuron then signals its muscle to act. This whole pathway is called an Arc Reflex Action Potential Organization of the Nervous System There are two major divisions The Central Nervous System: (CNS) brain and spinal cord The Peripheral Nervous System: (PNS) the sensory neurons and motor neurons Responsible for transmitting electrical messages throughout the body. Nerve: a bundle of several neuron axons The Brain Over 100 billion neurons Cerebrum: the largest part of the brain. Location of thought processes. Cerebellum: controls balance, posture, motor skills. Medulla oblongata: breathing and heart rate. Hypothalampus: body tempurature, thirst, hunger. The peripheral nervous system The somatic nervous system The autonomic nervous system Voluntary Involuntary Relays information to and Relays information to from skin and mucles internal organs Spooky links http://youtu.be/8-dZnp66t1Y www.youtube.com/watch?v=dxQmOR_QLfQ www.youtube.com/watch?v=2YZJt_Bw3eo
