Synapse. Synapse. There are two fundamentally different types of synapses: In a chemical synapse, electrical activity in the presynaptic neuron is converted (via the activation of voltage-gated calcium channels) into the release of a chemical called a neurotransmitter that binds to receptors located in the plasma membrane of the postsynaptic cell. The neurotransmitter may initiate an electrical response or a secondary messenger pathway that may either excite or inhibit the postsynaptic neuron. Chemical synapses can be classified according to the neurotransmitter released: glutamatergic (excitatory), GABAergic (inhibitory), cholinergic (e.g. vertebrate neuromuscular junction) and adrenergic (releasing norepinephrine). Synaptic communication is distinct from ephaptic coupling, in which communication between neurons occurs via indirect electric fields.
Specialized synapses[edit] For technical reasons, synaptic structure and function has mainly been studied at unusually large 'model' synapses, for example: File:Chemical synapse schema cropped.jpg. GeoNet Rapid (Beta) View from the ISS at Night. The-Observable-Universe.jpg (JPEG Image, 3850 × 1925 pixels) - Scaled (31%) Internet use. Astronomy. The Scale of the Universe Interactive. Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2012 March 12 The Scale of the Universe - Interactive Flash Animation Credit & Copyright: Cary & Michael Huang Explanation: What does the universe look like on small scales?
On large scales? Tomorrow's picture: dust before galaxies Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)NASA Official: Phillip Newman Specific rights apply.NASA Web Privacy Policy and Important NoticesA service of:ASD at NASA / GSFC& Michigan Tech. Photopic Sky Survey. The Size Of Our World. Solar System Scope. Your Age on Other Worlds. Want to melt those years away? Travel to an outer planet! <div class="js-required"><hr> This Page requires a Javascript capable browser <hr></div> Fill in your birthdate below in the space indicated.
(Note you must enter the year as a 4-digit number!) Click on the "Calculate" button. Notice that your age on other worlds will automatically fill in. Notice that Your age is different on the different worlds. The Days (And Years) Of Our Lives Looking at the numbers above, you'll immediately notice that you are different ages on the different planets. The earth is in motion. The top-like rotation of the earth on its axis is how we define the day. The revolution of the earth around the sun is how we define the year. We all learn in grade school that the planets move at differing rates around the sun. Why the huge differences in periods? Johannes Kepler Tycho Brahe Kepler briefly worked with the great Danish observational astronomer, Tycho Brahe. The Gravity Of The Situation Isaac Newton. Wallpaper: Mars Approaching Earth. Celestia: Home.
Interactive Sky Map. Earth View. Accelerating Human Evolution. This Will Mindfuck You: The Double-Slit Experiment. The video below shows scientific proof that there is something NOT quite logical or scientific about this universe.
The mere act of observation can completely change the outcome of an event! Before I get too ahead of myself, you need to watch the video below to understand: (Forgive the corny cartoon character explaining the concept — at least he knows his stuff) Recap: When a camera observed the electrons, they acted as particles. However, when the no equipment was used to observe the electrons, they acted as waves and particles simultaneously. So what’s the reason for this? Want even further proof? Then in 2002, a group of researchers set up the experiment in a way that the electron could not possibly receive information about the existence of an observing instrument.
The Results: The photons acted like particles 93% of the time that they were observed. What are the implications of this? 1. 2. 3. What other implications did you get out of these experiments? Awesome milk trick!. FutureofScience_Map_lg.jpg (JPEG Image, 1998 × 1332 pixels)
World-resources-map-r2.gif (GIF Image, 1450 × 1450 pixels) The Best and Worst Countries in Which to Pay Taxes. More Infographics on Good.