The Nervous System
Nervous System Two Subdivisions Central Nervous System (CNS) Brain Spinal cord Peripheral Nervous System (PNS) Nerves of the body
Central Nervous System Sensory info Source of: Thoughts Emotions Memories http://www.youtube.com/watch?v=cGSXaWJD75U http://www.youtube.com/watch?v=_vx1OVLX5Rc
Subdivisions of the PNS Somatic Nervous System Skeletal Muscles All senses except touch Voluntary Autonomic Nervous System Organs (except skeletal muscle) Involuntary
Continued Enteric Nervous System “Brain of the gut” GI tract Involuntary
Sympathetic vs Parasympathetic Branches of the ANS Have opposing actions Symp – increase HR Para- decreased HR Sympathetic “Fight or Flight” Parasympathetic “Rest and Digest”
Brainpop Terms Neuron Stimulate Neurotransmitter Autonomic Somatic Reflex Provide examples of autonomic and somatic examples : )
Reaction Time Lab Analysis Which division(s) of the nervous system were working during lab? What leads you to think this? Was there a difference in the average distances between arms and fingers for the meter stick drop? Explain why. How many hours of sleep did you get the night before our lab? Do you think there is correlation between reaction time and amount of sleep? Explain your reasoning.
Basic Functions of the Nervous System Sensory Gathers info Integration Process Info Motor Responds to signals Maintains homeostasis
What is nervous tissue made up of? Neurons Functioning unit Neuroglia Support unit
Neuron Brainpop again!! Synapse Dendrite Soma Nerve Describe how the body is able to send messages
Neuroglia Multiply or divide in mature NS Schwann Cells (PNS) E.x Injury or disease Schwann Cells (PNS) Produce/maintain the myelin sheath for a single axon
Organization of the NS (Figure 9.1) Nerves Ganglia Enteric Plexuses Sensory Receptors
Cell to cell Communication Done at a synapse What is a synapse? Neurotransmitters are released What are neurotransmitters? Describe the process of cell to cell communication
Blind Spot What are photoreceptors? Optic Nerve Specialized neurons in the eye Optic Nerve No photoreceptors No info to brain Brain “makes up” missing info
Action Potentials http://www.youtube.com/watch?v=ifD1YG07fB8
Action Potentials Which conditions exist inside and outside of a cell during resting potential? When does an action potential occur? How is this achieved?
Action Potentials and Neurotransmitters What happens when the action potential reaches the axon terminal?
Food and Mood Do you think that certain food can alter your mood? Do you think that people can become physically addicted to certain foods? After reading the article, would you change your eating habits? Why or why not?