Learning objectives Define the nervous system and understand how it works The general function of the nervous system The pathway by which sensory information reaches the brain The basic principles of neuronal communication
Clicker question #1 Which of the following is controlled by the nervous system? A.Reading B.Digestion C.Knee-jerk reflex D.Breathing E.All of the above
Nervous system Dopaminergic Neurons Kenyon cells Output Neurons Other Modulatory Neurons The Central Nervous System (CNS): brain & spinal cord The Peripheral Nervous System (PNS): sensory receptors & motor effectors. The communication between CNS and PNS.
Nervous system: how does it work?
Concept mapping/sorting You are about to enjoy a hot steaming cup of espresso freshly brewed and prepared for you. Place the post it cards given to your group in three categories on the white board: CNS, PNS, and/or Both. Work in groups of 4
You see the coffee You smell the espresso I need that coffee now Coffee feels hot I am sleepy You pick up the cup Sip the coffee Espresso tastes good This coffee is bitter Taste the coffee
Clicker question #2 Which of the following activities involve Central Nervous System (CNS)? A.Knee-jerk reflex B.Using the clicker C.Pupil Dilation D.All of the above
A neuron and its parts Electrical Signal Dendrites Axon Myelin Chemical Signal
Clicker Question #4 Have you ever stubbed your toe and said “Ouch!” before it actually started hurting? With your knowledge of the nervous system, how might you explain this phenomenon? A.Your response is a reflex that doesn’t involve the CNS (Central Nervous System) B.Saying “Ouch” might make it hurt less C. Your toe nerves are directly connected to your mouth nerves D. Pain sensation travels through un-myelinated axons while normal touch travels through myelinated ones
Activity Un-myelinated axon Myelinated axon Synapse Neuron B
Clicker Question #3 What is the fastest way to pass a signal through a neuron? A.With chemicals B.From node to node C.By diffusion D.Via radioactivity