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tiffany blake

on 8 November 2010

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Transcript of Nervous

Hear Smell Sensory Receptors:

-pain receptors: detect pain
~everywhere except brain
-thermoreceptors: detect temperature
~at skin, body core
-mechanoreceptors: detect touch, pressure, sound, motion
~at skin, skeletal muscles, ears
-chemoreceptors: detect chemicals
~at nose and taste buds
-photoreceptors: detect light
~at eyes Taste See Touch Five Senses Brain Peripheral
Nervous System all the nerves not a part of the brain or spinal cord transmits impulses from sense organs to the Central Nervous System divided into 2 subsystems: Somatic Nervous System Autonomic Nervous System reflexes and conscious
controls are processed here controls involuntary responses Parasympathetic Sympathetic slows body activities quickens body activities HOMEOSTASIS REFLEX A reflex is an involuntary response as a result of a stimulated receptor organ unconditioned conditioned not based on a personal experience based on a personal experience receptor organ begins the impulse the impulse goes to the muscle impulse is carried to the Central Nervous System axon: carries impulses away from the cell body to other cells dendrites: recieve impulses from other cells myelin sheath: insulator Neurons Sensory Organs have sensory receptors so they can respond to stimuli The Skin contains sensory receptors
that respond to temperature, feeling, and pain.
How much you feel depends on the amount
of receptors in the area (density)

DID YOU KNOW: feet and hands have more receptors
than the rest of a human's body, so you have more
feeling there than anywhere else Smell is when the nose detects chemicals in the environment.
Chemoreceptors in the nose send impulses
to the brain based on those chemicals,
allowing you to smell. Taste buds are the sense organs for taste, which, like smell detects chemicals and sends impulses based on those chemicals to the brain. Most taste buds are located on the tongue Impulses electrical signals from the brain Stimulated Cells Cells that are not stimulated they are stimulated by sense organs both weak and strong stimuli cause the same speed of impulse strong stimuli get a stronger response because more fibers are activated inside the cell: the charge is negative
outside the cell the charge is positive moving impulse= a neuron is stimulated by another or an external stimuli Mr.Hall's Brain The Brain He Wishes He had!! Nervous System The skin contains sensory receptors that respond to temperature, pain, and touch. How much you feel depends on the amount of receptors that are in the area (density) and the amount that are excited. Central Nervous System consists of the brain and spinal cord controls physical and mental activity short term memories, emotions, and hearing controls touch and movement, as well as body positions.
Also detects elements of the environment so the body can react to them processes sights, visual processing center of the brain cerebrum brain stem cerebellum, pons and medulla controls balance, walking, posture, and coordination frontal lobe temporal lobe parietal lobe occipital lobe Cerebrum Brain Stem controls involuntary actions regulate flow of information throughout the brain and the body PONS AND MEDULLA also control some involuntary actions brings messages back and forth from the spinal cord, cerebellum, and cerebral cortex thalamus:
recieves impulses from the body and gives it to the right region of the cerebellum hypothalamus:
controls recognition of thirst, hunger, anger, and temperature example: if the body temperature is too high, the hypothalamus causes the body to sweat so the blood can cool down FOREBRAIN MIDBRAIN HINDBRAIN SPINAL CORD links the body to the brain reflexes are processed here has nerve fibers to send information to and from the brain Disorders Careers Interesting Facts The brain has 2 hemispheres, the right one controls the left side of the body and the left controls the right the cerebellum detects the signal sent to the muscle and the movement the muscle made, and if there is a difference, the cerebellum fixes it There are 43 pairs of nerves that go from the brain to the body 12 cranial and 31 spinal The location at which a neuron transfers an impulse to another cell is called a synapse these nerves link the spinal cord to the body CONTROLS RESPONSES TO STIMULI impulse-conducting cells cell body: contains the nucleus CEREBELLUM neurochemistry is the study of neurochemicals, which include neurotransmitters and other molecules such as neuro-active drugs that influence neuron function. neurochemist a neurologist is a medical doctor who has trained in the diagnosis and treatment of nervous system disorders, including diseases of the brain, spinal cord, nerves, and muscles. Neurologist psychiatry is the medical speciality devoted to the study and treatment of mental disorders- which include various affective, behavioural, cognitive, and perceptual disorders. psychological tests and physical examinations may be conducted, including on occasion the use of neuroimaging or other neurophysiological techniques. Psychiatrist inherited neuropsychiatric disorder with onset in childhood characterized by the presence of multiple physical tics, and at least one vocal tic. tourettes a psychiatric diagnosis that describes a category of mood disorders defined by the presence of one or more episodes of abnormally elevated energy levels, cognition, and mood. bipolar disorder refers to the extreme difficulty some children and adults have in monitoring attention span and controlling impulsive behaviours. these problems are often accompanied by an obvious hyperactivity. attention deficit disorder(add) salary: 42,000/ year Disease Alzheimer Disease destroys brain cells, causing memory loss
causes problems with behavior and thinking
currently has no cure Care healthy diet exercise Vitamin D water Current Research Edward Brown and University of Rochester are researching the sympathetic nervous system and how nerve fibers interact with tumor growth Interaction With Other Systems Skeletal: The skull protects the brain
Circulatory: The brain regulates the heart rate and blood pressure
Muscular: The brain controls movement
Digestive: The nervous system regulates it
Endocrine: Hormones provide feedback to the brain
Lymphatic: The brain controls the body's defense
Respiratory: The brain regulates respiratory rate
Reproductive: The brain controls behavior to find mates
Excretory: The bladder sends information to the brain
Integumentary: Receptors in the skin send information to the brain Most complex organ in the human body
functions like a camera
light enters throughthe cornea
The pupil is like the shutters of a camera because, it
controls the amount of light entering
The lining in the back of the eye is the retina which, relates to the film in a camera
The light comming into the retina sends a record of it through the optic nerve to the brain Vibrations of the eardrum create sound to help us hear. When the vibration is moved to the conlea sentive hairs activate the generation of nerve signals which are then sent to the brain. DID YOU KNOW?

People hear sounds in frequencies between 20 to 20,000 hertz!!
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