1. In Class Notes By: Mrs. Swineheart's Fifth Hour
Nervous System
In Class Notes
By: Mrs. Swineheart's Fifth Hour

2. Function & Divisions: Functions: Divisions (2)
 sends/recieves information
 process information
sends messages to organs through communication lines called nerves
Divisions (2)
CNS (central nervous system)
bodys main informatoin prcessing center
Brain and Spinal Cord
PNS  (peripheral nervous system)
nervous tissue outside of the CNS
delivers information to CNS
carries messages to organs

3. Brain: Parts & Functions
Brainstem = The lower portion of the brain important for breathing and other vital functions.
Cerebrum= The largest part of the brain; it is responsible for learning and other conscious mental functions.
Thalamus= A midbrain structure that plays a major role in relaying information from the various sensory receptors to other brain areas.
Cerebellum= Region of the brain that plays an important role in the integration of sensory perception
Hypothalamus = a structure in the brain under the thalamus that monitors activities such as body temperature and food intake.

4. Parts of the Brain:

5. Lobes of the Brain & Functions:
Frontal = Top front, responsible for emotion and reasoning. 
Parietal = Middle, and is the sensory center.
Occipital = Back, used for vision and reading.
Temporal = Lower sides, hearing and memory. 

6. The Neuron:

7. Function of the Neuron:
 conducts nerve impulses
transmit signals at a fast rate.
 allows signals to transmit at a fast rate through the specific and other locations.

8. From one neuron to the next:
Synapse: junction between two neurons or a neuron and another cell or electrical or chemical signals are relayed.
Synaptic cleft: tiny space where nerve signal must be transmited.
Neurotransmitters: chemical messanger that carries information from one neuron to another or to another cell.
When the action potential reaches the knob, it causes the vestles to release the neurotransmitter into the synaptic cleft.Receptor molecules on the recieving neuron's membrane accept the neurotransmitter.

10. Reflex Arc: Uses 3 Parts: Examples: Sensory Input Integration
Motor Output
Examples:
Reflex check with doctor and hammer on your knee
Touching something hot
Feeling pain

11. Reflex Arc: sensory receptors reflex interneurons spinal cord
motor neurons
sensory neurons

12. Examples of Sensory Receptors:
Pacinian Corpuscles- Pressure/Pain
Meissner's Corpuscles- Sensitivity to light touch
Knee Jerk- Reflex
Thermoreceptors- Detect heat/cold
Mechanoreceptors- Gauge Touch, pressure, sketch, and motion
Chemoreceptors- Located in your nose and tastebuds, sensitive to certain chemicals
Photoreceptors- Receptive to various wavelengths of light, located in your eyes 

13. Drugs: 2 Types: Stimulants
Usually increase the amount of activity in the CNS
increases amount of alertness and heart rate (nicotine)
Depressants
Slow down CNS activity
causes less coordination and impairs judgement (alchohol)

14. Illnesses: Alzheimers Tourette Syndrome Lou Gehrigs Huntingtons
Muscular Dystrophy
ADD
Etc.