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Cells of the nervous system

Cells of the nervous system
Types of Neurons (Nerve Cells) The human body is made up of trillions of cells. Cells of the nervous system, called nerve cells or neurons, are specialized to carry "messages" through an electrochemical process. Neurons come in many different shapes and sizes. Neurons are similar to other cells in the body because: Neurons are surrounded by a cell membrane.Neurons have a nucleus that contains genes.Neurons contain cytoplasm, mitochondria and other organelles.Neurons carry out basic cellular processes such as protein synthesis and energy production. However, neurons differ from other cells in the body because: Neurons have specialize cell parts called dendrites and axons. The Neuron One way to classify neurons is by the number of extensions that extend from the neuron's cell body (soma). Bipolar neurons have two processes extending from the cell body (examples: retinal cells, olfactory epithelium cells). Pseudounipolar cells (example: dorsal root ganglion cells). What is inside of a neuron? Related:  Life Sciences

Nervous System: Interactive Views and Information | Anatomy Guide [Continued from above] . . . conditions inside and outside of the body and send this information to the CNS. Efferent nerves in the PNS carry signals from the control center to the muscles, glands, and organs to regulate their functions. Nervous TissueThe majority of the nervous system is tissue made up of two classes of cells: neurons and neuroglia. Neurons. Neurons, also known as nerve cells, communicate within the body by transmitting electrochemical signals. Brain The brain, a soft, wrinkled organ that weighs about 3 pounds, is located inside the cranial cavity, where the bones of the skull surround and protect it. Spinal CordThe spinal cord is a long, thin mass of bundled neurons that carries information through the vertebral cavity of the spine beginning at the medulla oblongata of the brain on its superior end and continuing inferiorly to the lumbar region of the spine. Afferent, Efferent, and Mixed Nerves. Dura mater. Sensory. Divisions of the Nervous System Sympathetic.

Ocean trench: Take a dive 11,000m down Icy cold, pitch black and with crushing pressures - the deepest part of the ocean is one of the most hostile places on the planet. Only three explorers have made the epic journey there: 11km (seven miles) down to the bottom of the Pacific Ocean's Mariana Trench. As a new wave of deep-sea exploration begins, take a look at the mysterious world that they will be plunging into. Pressure Test: Diving 100m down With the help of some polystyrene heads, science reporter Rebecca Morelle finds out what happens at the pressure experienced 100m below sea level. Pressure Test: Diving 1,000m down The BBC's Rebecca Morelle reveals what happens to a polystyrene head as it is subjected to the pressure 1,000m below the waves. Atmospheric diving suit They may look as clunky as a suit of armour but some atmospheric diving suits (ADS) can enable people to reach depths of up to 600-700m. Elephant seal - expert diver This southern elephant seal is a fantastic diver and reach depths of up to 2,000m.

Bloomin' Brains Summer Camp - Sowing the Seeds of Neuroscience 2016 Bloomin' Brains Summer Camp was held from August 1 to August 5, 2016. Camp applications for summer 2017 will be available early next year. Are you a middle school student interested in a summer "deep dive" into neuroscience and botany? Spend a week in at UW working with scientists, teachers, and specialists to explore, experiment, and discover! Conduct hands-on science experimentsLearn about uses of medicinal plants in Native cultures Explore the structure and function of the brainEnjoy field trips to the Burke Museum, Botany Greenhouse, Medicinal Herb Garden, the Hyde Herbarium, and UW FarmListen to real scientists talk about their careersDiscover "the art of the brain" by constructing modelsMake a plant extract and tie-dye a shirt Discover how much fun science can be! This is a free summer camp funded by an NIH grant examining effective science education.

Your Brain & Nervous System Listen How do you remember the way to your friend's house? Why do your eyes blink without you ever thinking about it? Where do dreams come from? In fact, your brain is the boss of your body. Your brain has many different parts that work together. cerebrum (say: suh-REE-brum) cerebellum (say: sair-uh-BELL-um) brain stem pituitary (say: puh-TOO-uh-ter-ee) gland hypothalamus (say: hy-po-THAL-uh-mus) The Biggest Part: the Cerebrum The biggest part of the brain is the cerebrum. <a href=" your favorite way to challenge your brain? When you're thinking hard, you're using your cerebrum. The cerebrum has two halves, with one on either side of the head. Listen The Cerebellum's Balancing Act Next up is the cerebellum. Because of your cerebellum, you can stand upright, keep your balance, and move around. Brain Stem Keeps You Breathing — and More Another brain part that's small but mighty is the brain stem. Listen Pituitary Gland Controls Growth Listen Listen Back

Human Digestive System Advertisement. is a user-supported site. As a bonus, site members have access to a banner-ad-free version of the site, with print-friendly pages.Click here to learn more. (Already a member? The human digestive system is a complex series of organs and glands that processes food. Most of the digestive organs (like the stomach and intestines) are tube-like and contain the food as it makes its way through the body. The Digestive Process: The start of the process - the mouth: The digestive process begins in the mouth. On the way to the stomach: the esophagus - After being chewed and swallowed, the food enters the esophagus. In the stomach - The stomach is a large, sack-like organ that churns the food and bathes it in a very strong acid (gastric acid). In the small intestine - After being in the stomach, food enters the duodenum, the first part of the small intestine. The end of the process - Solid waste is then stored in the rectum until it is excreted via the anus.

Explore the Brain Advertisement. is a user-supported site. As a bonus, site members have access to a banner-ad-free version of the site, with print-friendly pages.Click here to learn more. (Already a member? THE FUNCTIONS OF THE BRAIN The human brain is a complex organ that allows us to think, move, feel, see, hear, taste, and smell. The brain produces electrical signals, which, together with chemical reactions, let the parts of the body communicate. The average human brain weighs about 3 pounds (1300-1400 g). At birth, the human brain weighs less than a pound (0.78-0.88 pounds or 350-400 g). The brain consists of gray matter (40%) and white matter (60%) contained within the skull. The brain has three main parts: the cerebrum, the cerebellum, and the brain stem (medulla). NOURISHMENT OF THE BRAIN Although the brain is only 2% of the body's weight, it uses 20% of the oxygen supply and gets 20% of the blood flow. Cerebrospinal fluid (CSF) surrounds the brain.

Physicists say there may be a way to prove that we live in a computer simulation If we are running in a simulation, then it is likely alterations to the simulation's basic suppositions are studied directly - as any society with the requirement to develop such technology would obviously need some reason to use its functions - either as research, analysis, or entertainment. That we are actively being monitored must be assumed. Therefore this conversation must also be monitored - or at the very least flagged for review as a state of proof. Depending on the simulation's requirements, we would then be analyzed, and our system taken off line to determine how we became self-aware of the simulation. Self-awareness of the simulation would be an immediate failure of whatever path was being studied, and likely cause any entertainment value associated with said simulation to decrease. Again, such self-awareness of the simulation nullifies some of its utility as a training, shaping, and analysis tool.

Next Generation Science Standards - Activity LIsting In this activity, students analyze the production and utilization of organic molecules in ecosystems. Students construct a food web for Yellowstone National Park, including producers, primary consumers, secondary consumers, decomposers, and trophic omnivores. Then, students analyze a trophic cascade that resulted when wolves were re-introduced to Yellowstone. Students learn how organic molecules move and are transformed in ecosystems as a result of the trophic relationships in food webs, photosynthesis, cellular respiration, and biosynthesis. This provides the basis for understanding carbon cycles and energy flow through ecosystems. In the final section, students use these concepts and quantitative reasoning to understand trophic pyramids. Download Student Handout: PDF format or Word formatDownload Teacher Preparation Notes: PDF format or Word format

Section 2 - Myelination & Diameter - CUNeurons Learning Objectives Understand the function of large diameter axonsUnderstand the effect of axon diameter on conduction velocityUnderstand the effect of myelination on conduction velocity Conduction Velocity & Axon Diameter The general rule of thumb is that the action potential conduction velocity, which varies from as little as 0.25 m/sec to 100 m/sec, increases approximately with the square root of fiber diameter. Many animals whose lives depend on ultra-fast reflexes have very large nerve axons to permit the rapid transmission of action potentials, such as squids, earthworms, fish, rabbits, insects, lobsters and crabs, and many more (Harline, Colman). The axons of nerves necessary for initiating defense or escape behaviors tend to be significantly large- some squid axons can be up to a millimeter in diameter, compared to about 0.002mm for a typical myelinated mammalian nerve (Silverthorn). Conduction Velocity & Myelination A video to show how conduction occurs in myelinated axons:

Circulatory System As of July 1, 2013 ThinkQuest has been discontinued. We would like to thank everyone for being a part of the ThinkQuest global community: Students - For your limitless creativity and innovation, which inspires us all. Teachers - For your passion in guiding students on their quest. Partners - For your unwavering support and evangelism. Parents - For supporting the use of technology not only as an instrument of learning, but as a means of creating knowledge. We encourage everyone to continue to “Think, Create and Collaborate,” unleashing the power of technology to teach, share, and inspire. Best wishes, The Oracle Education Foundation Hidden Talents--Right brain The Right "Animal" brain The right brain is the "animal brain" and analyzes the environment for all the sights and sounds useful for survival. In essence, animals are 100% "right-brained." Humans have kept the animal talents on the right side, but have modified the left brain for language and tool use. The following is a summary of talents found in the right brain. Vision Animals must be very concerned about their visual environment, both for food and danger. The Spatial Sense The spatial sense helps animals see objects in their mind, the "Minds Eye." (A) The Object-Spatial sense allows animals to "rotate" an object in their mind, imagining what it looks like from different angles. This is very useful to a cat to analyze where a mouse is hiding, mentally consider the mouse's path, and decide where to sit to be in the best position to ambush it. Human craftsmen use this talent extensively to build houses, design jewelry, fix cars, etc. Bees can fly home in a "bee-line" using the sun Music - K-12 Educator Community Page K-12 Educator Community Have a Question? Post it in the Forum! Learn about the latest in K-12 science content, teaching strategies, and professional development. Camp BIOmed – A Science Summer Camp! A list of 100 resources rated the highest by the LifeSciTRC Community. See More... A list of 100 collections rated the highest by the LifeSciTRC Community. See More...