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Nervous system

Biology project
by

Marshall Trout

on 4 May 2010

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Transcript of Nervous system

The Brain Frontal Lobe Temporal Lobe Occipital Lobe Parietal Lobe Cerebellum Brain Stem Cerebrum Largest region of the brain Conscious activity take places here Divided into four lobes Learning and decision making area of the brain Main organ of nervous system Emotion control center Personality motor function Problem solving Judgement Language The brain is made up of around one hundred billion neurons Sexual Behavior Primary organization Hearing memory Mathmatical area of the brain Sensation Perception Integrates senses Main area of vision Interprets sight Flips vision right side up coordinates movement Connects brain to spine Two regions Medulla oblangata pons Spinal Cord Balance puts muscle movements together Main connection between brain and rest of body Bundled nerves Involuntary movement Four parts Controls everything The Nervous System Peripheral Nerves Messenger nerves Sends information to the brain Recieves Messages Run throughout the body Neuron Creates all nervous system organs Delivers messages Sends Messages Two states:
resting potential and action potential Resting potential Cell is negatively charged Positive ions outside Negative ions inside Maintains negative charge through active transport Sodium pumped out Potassium let in Action Potential Synapses between cells Na (Sodium) in K (Potassium) out 2. Sodium enters causing positive charge + - - - - - - - 3. Sodium gates close 1. Sodium gates open 4. Potassium enters (charge negative) Messages Synapses Protected by spine Neurotransmitters- certain chemicals that carry messages across the gap Stimulus attracts sodium The 5 senses Sight Hearing Smell and Taste Touch Eye
Focus light Adjust pupil size Where light enters Pupil- Focus on distance Converts light into electric signals
(upside down) Air vibrations travel through Transfers vibrarions to bones Liquid filled chamber with hairs that pick up vibration in liquid Thalamus and Hypothalamus Thalamus Hypothalamus Relays information to correct region of the brain Recognizes needs such as hunger Recognizes anger Coordinates nervous and endocrine system The ear Taste and smell Response to certain chemicals Most "taste" is smell Most taste buds are on the tongue Touch Receptors all over skin Highest concentration of receptors is in toes, fingers, and face Diseases/Disorders Epilepsy Dementia Paralysis Causes seizures Abnormal signals Imbalance in neuro transmitter chemicals Hallucinations Dellusions Paranoia Aging of the brain Memory loss Brain losses signal to area of the body Loss of function No feeling Career Phsycobiologist Starting salary: 64,000 Can work up 140,000 Studies how the brain interacts with the body with decision making and behaviors Requires Masters degree (PhD. is preferred) in biology, physcology, or neurology Homeostasis Center of homeostasis Controls and regulates everything in the body involountary actions Interesting facts Brain is average of three pounds Brain uses more blood then any other organ How to care Avoid head injuries Avoid drugs Current research "splicing" into brain How to lose addictions Connecting prosthetic limbs
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