Biological Rhythms essays

Biological Rhythms essays All plants and animals have endogeous cycles that, in response to an outside rhythm (zeitgeber), will cue various actions. For example, bears know they must hibernate, poinsettias know they must flower and humans know they need sleep. In correspondence with a particular season, length of day, and light intensity respectively, these events will occur. In the example with the poinsettia, the vegetative/flower cycle is synchronized with a day length cycle that has longer hours of darkness, resulting in a chemical reaction that releases florigen and signals to the poinsettia to flower. Similarly, a chemical reaction takes place in humans with their sleep/wake cycle. This will be discussed in the essay along with disorders associated with this cycle. Humans possess many biological clocks. Depending on the cycle it could be an infradian (longer than a day), ultradian (shorter than a day), circadian (about a day), or circannual (about a year) rhythm. In the case of the humans internal sleep/wake cycle, its a circadian rhythm. The human sleep/wake cycle is a bit longer than 24 hours (closer to 25 hours), therefore it needs an entraining agent or zeitgeber. This is an external environmental rhythm which will keep it in sync with the 24 hour day. The most dominant cycle is the light/dark cycle. However, its necessary to transmit the external information to the internal cycle so that synchronization is achieved. As infants, our sleep/wake cycle was initially random compared to that of our parents or guardian. Eventually, over the course of 6 weeks, we began to adapt the circadian cycle and after approximately 4 months, we were entrained to the 24-hour cycle. This is due to the external cues of our parents/guardian. The human clock is found in the suprachiasmatic nucleus (SCN), which is a group of distinct cells in the hypothalamus, which is located in the brain. Light from the outsid ...

10 of The Best College Party Themes You Simply Have to Try

10 of The Best College Party Themes You Simply Have to Try Of course, college is a time for working hard and pushing yourself to grab that final mark which will catapult you into your chosen career, but it’s also a time for having fun and making memories which will last a lifetime. As clichà © as that may sound, it’s the basic truth of the matter. All work and no play makes life rather dull indeed! If you’re wanting to throw a party which will be remembered for year to come, for the right reasons of course, and you’re looking for a little inspiration for your party themes, how about one of these for size? Rock the White Isle – an Ibiza-Inspired Party It doesn’t have to be summer to remember party central on the clubbing island we all know and love. Turn up the heating if you need to, but clubbing gear is the dress code, glow sticks are as standard, and clubbing tunes are blaring from the speakers. Hawaii Surfer Chic Laid-back surfer dudes and chicks ready to catch a wave? This is the iconic summer theme to enjoy, with hula dancing, bikinis, grass skirts, surfer shorts, and a totally laid-back vibe. Great for memories of summer, whether you went to Hawaii or not! Snow Bunny Fun When the weather outside is a little more on the Baltic side than sunny, why not take advantage of it and turn your party into a snow bunny theme? Think ski outfits, think wrapping up warm, and you know what? Turn the heating off to save money and add to the ambience! Delegate your write my essay task to professional writers while you have fun! Neon Colours This one is easy and cheap for everyone attending – basically, anything you wear has to be neon coloured and you can turn that around to the drinks too, with neon coloured beverages, and perhaps even a cake with more than a sprinkling of food colouring to fit in with the theme! Come Dine With Me You can look at this one in two ways – a) everyone brings some food so you don’t have to pay for the food, and b) if you say everyone has to cook something, you’re developing their cooking skills, so it’s win-win! Take inspiration from the TV show, but turn it into a party rather than a dining experience; think dips and nachos, pizzas, nibble foods, that kind of thing. The most imaginative snack wins a prize. Masquerade â€Å"Ball† You don’t need to kit everyone out in a ball gown and suit for this, but guests simply need to wear a mask, which can easily be bought online! The rest can be normal clothes, but the fun is in guessing who is who! A Spooky Halloween Party This is easy, because around the big day you can easily pick up enough cheap items to dress up a house or dorm room and buying a mask is an easy task too, so no need to break the bank. Make a bowl of punch, some scary snacks, and you’re away. Stupid Jumper Night Think Christmas and the new craze of wearing the most ridiculous knitted jumper you can find. Now, turn that on its head and make a party out of who can wear the most stupid jumper regardless of the time of year. Again, turn it into a competition, because the person with the most ridiculous outfit wins a prize. ABC Party This is one that is iconic in the college party world and ABC basically stands for Anything But Clothes. Now, don’t panic! We’re not suggesting your guests rock up naked, but what they do wear has to be made from something else, for example, a bin liner fashioned into a dress, or a bed sheet turned into a skirt. You get the idea. Toga Party No college experience is complete without a toga party. Now, this has many advantages, and the main one is that it’s cheap because you can make a toga out of anything, even a bed sheet! Simply wrap some rope around it and you ta-da! You have a toga the Ancient Greeks would have been proud of! These are just a few ideas you can incorporate into your college party themes; all of them will certainly be nights to remember! This article was made by writing service.