The Nervous System Nervous System Divided into 1

The Nervous System

Nervous System Divided into: 1. Central Nervous System (CNS) 2. body Controls the _____ Peripheral Nervous System (PNS) communication Relays ______ b/w brain and body

Basic Functions of the Nervous System Sensory Gathers info ______ 2. Integration ______ Processes info 3. Motor Responds to signals Maintains homeostasis _______ 1.

The Neuron

Myelination � Schwann Cells (PNS) Produce/maintains myelin sheath the _______ for each axon � Myelin sheath _____ Increases the speed nerve impulses of _______ Increase with age

CNS vs PNS � http: //www. youtube. com/watch? v=c. GSXa. WJD 75 U � http: //www. youtube. com/watch? v=_vx 1 OVLX 5 Rc

Table Talk � Which division of the nervous system was activated by the video clip? � Why are babies less coordinated than adults? Their neurons are not fully myelinated Signals are not sent as fast as in adults This continues into teenage years

Structural Classification of Neurons � Determined by the # processes attached to the cell body Process

How do cells communicate? � Use neurotransmitters � Neurotransmitters are released into ______ the synapse

How does temperature effect neurons? Cold slows down the � ________ release of neurotransmitters � ________ Action potentials are not firing as quickly � https: //www. youtube. c om/watch? v=fgqf. Quiv Dr. U � https: //www. youtube. c om/watch? v=d. TKPWpx 89 No

Action Potentials � http: //www. youtube. c om/watch? v=if. D 1 YG 07 f. B 8

Action Potentials � Resting Potential � Action Potential

Action Potentials and Neurotransmitters � When the action potential reaches the axon terminal

Excitatory vs Inhibitory � Excitatory action potentials release of neurotransmitter � Inhibitory action potentials release of neurotransmitter

Dopamine � Causes feelings of euphoria � Activates the pleasure center � Both excitatory (elevates mood) and inhibitory (depression)

Nervous System Lab Analysis Was there a difference in the average distances between arms and fingers for the meter stick drop? Why do you think this is the case? 2. 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. 3. Was there a difference in average distance between neurons in the different areas tested on your body? 1. a. Which was the shortest and which was the longest? Why do you think this is the case?

Blind Spot � Photoreceptors Specialized neurons in the eye � Optic Nerve No photoreceptors No info to brain Brain “makes up” missing info