Seen up close, the anatomy of a mosquito bite is terrifying. The most dangerous animal in the world uses six needle-like mouthparts to saw i...
Seen up close, the anatomy of a mosquito bite is terrifying. The most dangerous animal in the world uses six needle-like mouthparts to saw into our skin, tap a blood vessel and sometimes leave a dangerous parting gift.nnSUBSCRIBE to Deep Look! http://goo.gl/8NwXqtnnDEEP LOOK is a ultra-HD (4K) short video series created by KQED San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Get a new perspective on our place in the universe and meet extraordinary new friends. Explore big scientific mysteries by going incredibly small.nn*AFTER A SHORT BREAK, WE’LL BE BACK ON JULY 12 WITH NEW EPISODES EVERY OTHER TUESDAY.*nnScientists have discovered that the mosquito’s mouth, called a proboscis isn’t just one tiny spear. It’s a sophisticated system of thin needles, each of which pierces the skin, finds blood vessels and makes it easy for mosquitoes to suck blood out of them. nnMale mosquitoes don’t bite us, but when a female mosquito pierces the skin, a flexible lip-like sheath called the labium scrolls up and stays outside as she pushes in six needle-like parts that scientists refer to as stylets. nnTwo of these needles, called maxillae, have tiny teeth. The mosquito uses them to saw through the skin. They’re so sharp you can barely feel the mosquito biting you. nn“They’re like drill bits,” said University of California, Davis, biochemist Walter Leal.nnAnother set of needles, the mandibles, hold tissues apart while the mosquito works.nnThen the sharp-tipped labrum needle probes under the skin, piercing a vessel and sucking blood from it. nnThe sixth needle – called the hypopharynx – drools saliva into us, and delivers chemicals that keep our blood flowing. Mosquito saliva also makes our blood vessels dilate, blocks our immune response and lubricates the proboscis. It causes us to develop itchy welts, and serves as a conduit for dangerous viruses and parasites.nn---+ Read the entire article on KQED Science:nhttp://ww2.kqed.org/science/2016/06/07/how-mosquitoes-use-six-needles-to-suck-your-bloodnn---+ What is the deadliest animal in the world?nMosquitoes are the deadliest animals in the world to us humans. The diseases they transmit kill hundreds of thousands of people each year. n n---+ How many people get malaria each year?nIn 2015, malaria, the deadliest mosquito-borne disease, killed roughly 635,000 people, mostly children under the age of five and pregnant women in sub-Saharan Africa. nn---+ What diseases do mosquitoes transmit?nMalaria, dengue, yellow fever, West Nile and Zika are some of the diseases that mosquitoes transmit. nnDengue fever, transmitted Aedes aegypti mosquitoes, is estimated to make almost 400 million people sick with jabbing joint pain each year. nnScientists also believe that Aedes aegypti mosquitoes are the main culprit for more than 350 confirmed cases of congenital malformations associated with the Zika virus in the northeastern Brazilian state of Pernambuco. Since last October, an unusually high number of babies have been born there with small heads and a host of health problems like convulsions, suspected of being caused by a Zika virus infection early in their mother’s pregnancy.nn---+ What diseases can I get from mosquitoes in the United States?nWest Nile virus is the most important of several mosquito-transmitted viruses now native to the U.S., according to the Centers for Disease Control.nn---+ More Great Deep Look episodes:nnThe Bombardier Beetle And Its Crazy Chemical Cannonnhttps://youtu.be/BWwgLS5tK80nnWinter is Coming for These Argentine Ant Invaders https://youtu.be/boyzWeHdtiInn---+ About KQEDnnKQED, an NPR and PBS affiliate in San Francisco, CA, serves Northern California and beyond with a public-supported alternative to commercial TV, Radio and web media.nnFunding for Deep Look is provided in part by PBS Digital Studios and the John S. and James L. Knight Foundation. Deep Look is a project of KQED Science, which is also supported by HopeLab, the David B. Gold Foundation, the S. D. Bechtel, Jr. Foundation, the Dirk and Charlene Kabcenell Foundation, the Vadasz Family Foundation, the Gordon and Betty Moore Foundation, the Smart Family Foundation and the members of KQED.nn--nnVideo of mosquito labrum probing under mouse skin from:nChoumet V, Attout T, Chartier L, Khun H, Sautereau J, et al. (2012) Visualizing Non Infectious and Infectious Anopheles gambiae Blood Feedings in Naïve and Saliva-Immunized Mice. PLoS ONE 7(12): e50464. doi:10.1371/journal.pone.0050464 . nUsed under the terms of: http://creativecommons.org/licenses/by/4.0/nnAnimations based on drawing in Choo Y-M, Buss GK, Tan K and Leal WS (2015) Multitasking roles of mosquito labrum in oviposition and blood feeding. Front. Physiol. 6:306. doi: 10.3389/fphys.2015.00306nUsed under the terms of: http://creativecommons.org/licenses/by/4.0/ Less
