nervous system facts and trivias?
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Most nerves can only fire at about 50 times per second.\n\nNerves both conduct electricity and they produce it.\n\nThere are some nerves that extend from the feet all the way to the brain, making the cells over 5 feet long in some people.\n\nWhile the signal in the nerve is electrical, the signal is tranmitted to other nerves only chemically, using neurotransmitters in the synapsis.\n\nA nerve can only fire or not fire. There is no partial signal transmitted. Analog information is created by frequency of firings, and combinations of nerves firing.
1022032
#    The average human brain has about 100 billion nerve cells.\n\n# Nerve impulses to and from the brain travel as fast as 170 miles (274 km) per hour.\n\n# The thyroid cartilage is more commonly known as the adams apple.\n\n# The only jointless bone in your body is the hyoid bone in your throat\n\n# It's impossible to sneeze with your eyes open.\n\n# Your stomach needs to produce a new layer of mucus every two weeks or it would digest itself.\n\n# It takes the interaction of 72 different muscles to produce human speech.\n\n# The average life of a taste bud is 10 days.\n\n# The average cough comes out of your mouth at 60 miles (96.5 km) per hour.\n\n# Relative to size, the strongest muscle in the body is the tongue.\n\n# Human thigh bones are stronger than concrete.\n\n# When you sneeze, all your bodily functions stop even your heart.\n\n# Babies are born without knee caps. They don't appear until the child reaches 2-6 years of age.\n\n# Children grow faster in the springtime.\n\n# It takes the stomach an hour to break down cow milk.\n\n# Women blink nearly twice as much as men.\n\n# Blondes have more hair than dark-haired people do.\n\n# There are 10 human body parts that are only 3 letters long (eye hip arm leg ear toe jaw rib lip gum).\n\n# If you go blind in one eye you only lose about one fifth of your vision but all your sense of depth.\n\n# The average human head weighs about 8 pounds.\n\n# Our eyes are always the same size from birth, but our nose and ears never stop growing.\n\n# In the average lifetime, a person will walk the equivalent of 5 times around the equator.\n\n# An average human scalp has 100,000 hairs.\n\n# The length of the finger dictates how fast the fingernail grows. Therefore, the nail on your middle finger grows the fastest, and on average, your toenails grow twice as slow as your fingernails.\n\n# The average human blinks their eyes 6,205,000 times each year.\n\n# The entire length of all the eyelashes shed by a human in their life is over 98 feet (30 m).\n\n# Your skull is made up of 29 different bones.\n\n# Your ears and nose continue to grow throughout your entire life.\n\n# After you die, your body starts to dry out creating the illusion that your hair and nails are still growing after death.\n\n# Hair is made from the same substance as fingernails.\n\n# The average surface of the human intestine is 656 square feet (200 m).\n\n# A healthy adult can draw in about 200 to 300 cubic inches (3.3 to 4.9 liters) of air at a single breath, but at rest only about 5% of this volume is used.\n\n# The surface of the human skin is 6.5 square feet (2m).\n\n15 million blood cells are destroyed in the human body every second.\n\n# The pancreas produces Insulin.\n\n# The most sensitive cluster of nerves is at the base of the spine.\n\n# The human body is comprised of 80% water.\n\n# The average human will shed 40 pounds of skin in a lifetime.\n\n# Every year about 98% of the atoms in your body are replaced.\n\n# The human heart creates enough pressure to squirt blood 30 feet (9 m).\n\n# You were born with 300 bones. When you get to be an adult, you have 206.\n\n# Human thighbones are stronger than concrete.\n\n# Every human spent about half an hour as a single cell.\n\n# There are 45 miles (72 km) of nerves in the skin of a human being.\n\n# The average human heart will beat 3,000 million times in its lifetime and pump 48 million gallons of blood.\n\n# Each square inch (2.5 cm) of human skin consists of 20 feet (6 m) of blood vessels.\n\n# During a 24-hour period, the average human will breathe 23,040 times.\n\n# Human blood travels 60,000 miles (96,540 km) per day on its journey through the body.
613073
Most mammals have pretty much the same nervous system set up as we do.  \n\nThere might be a few differences in the number and size of some of the major sensory nerve bundles.  Humans don't have much in the way of an olfactory nerve, while other critters would have much larger nerves to carry more information.
1015294
Turns brain into swiss cheese. :(\n\nYou can read a wide range of info on the human form, CJD, by clicking HERE\n\nhttp://search.yahoo.com/search?p=cjd&ei=UTF-8&fr=FP-tab-web-t&x=wrt
282482
Nervous system damage and organ failure.
663107
A diagram is a picture (basically) where you write or type in information pertaining to the picture.\n\nIn your case, I would draw out the nervous system (all the organs like the brain and the nerve "cords," etc.) then use labels to document all the steps of what happens when a signal is sent from the brain to your arms or legs or vice versa.\n\nIf you have PowerPoint, you could copy and paste a good picture from somewhere (Be sure to cite your source!!) and make an "animated" version of the steps.  Really jazz it up!!\n\nGood luck!!\n\nHave an AWESOME day!!\n\nCosmicKelly  :)
1175801
http://en.wikipedia.org/wiki/Circulatory_system
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The brain is part of the nervous system.  The smallest component of the nervous system are axons, which have a head and a tail.  Millions of these line up head to tail and form the nerve endings in your body.  In the space between each head and tail (called a synapse) chemicals can flow.  When something happens (you prick yourself), an axon signals chemicals to flow between the synapse, activate the next axon, and the next until the message reaches your brain and you react.  Different drugs affect the ability for these chemicals to flow across the synapse (speeding up, slowing down, or not at all) or wipe out axons all together leaving gaps in the message chain.
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http://www.britannica.com\nhttp://www.kidinfo.com\nhttp://www.brainpop.com\nhttp://www.factmonster.com
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http://kevan.org/brain.cgi?nameMitchS
251534
There are many, you could try investigating different systems separately:\n- skeleton: detachment of pectoral girdle from skull, attachment of pelvic girdle to column; vertebrae with zygapophyses, limbs with digits, etc.\n- tegument: keratinization, impermeabilization, glands; thermal and hydric regulation.\n- sensory: eye pigments, middle ear with tympanum, loss of lateral line system.\n- other systems: lungs, kidney structure, large intestin, double circulation, etc.
270751
http://www.pursuit-performance.com.au/polar/html/polar/about_hrm.html\n\nhttp://en.wikipedia.org/wiki/Circulatory_system\n\nhttp://en.wikipedia.org/wiki/Blood_vessel
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1. Nerve anatomy: nerves are axons of a neuron, enclosed by myelin, and are part of the peripheral nervous system. Afferent nerves carry sensory information from the body to the dorsak root ganglia of the spinal cord and then to the brain (although cranial nerves go directly to the brain). Efferent nerves carry motor information from the brain to the body (muscles) to contract or relax. \n\n2. Reflex architecture: reflex arc. Sensory info (i.e. pressure) activates specialized sense receptors-->sends afferent signal to dorsal root ganglia of spinal cord-->sends info to interneuron-->sends info to ventral root-->sends efferent info to muscle-->muscle contracts (or relaxes, muscles work in pairs).\n\n3. Embryo forebrain-->telencephalon (cerebral cortex, basal ganglia, and limbic system). Midbrain-->Mesencephalon (thalamus, hypothalamus). Hindbrain-->metencephalon (cerebellum and pons) and myelencephalon (medulla oblongata).\n\n4. Functions of what?\n\n5. Hearing: consists of outer, middle, and inner ear. Outer ear is ear canal, middle ear is the ear drum and 3 smallest bones in body (hammer, anvil and stirrup), inner ear is the cochlea. Sound waves travel through the canal, cause the ear drum to vibrate, which moves the 3 bones, which causes the fluid in the cochlea to move, which activates the hair cells (receptors) that send infor to the auditory cortex in the brain.\nVision: from the outer eye to inner eye, you have cornea, iris, pupil, lens, vitreous humor, and the retina (which has the receptors). Within the retina, you have photoreceptors, bipolar cells, ganglion cells, and amacrine cells. Photoreceptors are rods (light) and cones (color). From the ganglion cells, information gets sent to the primary visual cortex in the brain.\n\n6. The spinal cord is long tube protected by vertebral column. It has white matter (axons or nerves from above definition) on the outside and gray matter (cell bodies) on the inside. The gray matter kind of looks like a butterfly in the spinal cord.\n\n7. Cerebellum: coordinated movement\nThalamus: sensory relay station\nCerebrum: divided into 4 sensory lobes, performs several higher functions such as language, emotion, and memory.\nHypothalamus: controls autonomic nervous system and endocrine systems (4 F's: fighting, feeding, fleeing, and mating...)\nMedulla: controls vital functions (cardiovascular, respiration, and skeletal muscle tone).
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Not too sure if you're interested in this type of stuff. http://www.getbodysmart.com\nhttp://www.gwc.maricopa.edu/class/bio201/brain/brshpx.htm\nalso the bbc.uk website has some interactive stuff where you have to match the parts to where they belong.
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Sympathetic nervous system
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http://www.medtronic.com/neuro/ttp/ps_jerry.html\ntry this, it tells all about it.
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Nervous system is the control center which consists of Brain, Spinal Cord and an enormous network of nerves that spread throughout your body. These nerves are responsible for the information flow between nervous system and other systems [ digestive, respiratory, circulatory etc etc ] in the entire body. Nervous system controls and coordinates the functioning of all other systems that exists in a body.