Extreme Environments

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Sahara Desert

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Extreme Environments

  1. 1. Extreme Environments Sahara Desert By: Katie Castrogiovanni
  2. 2. Homeostasis <ul><li>The ability of the human body to maintain a constant internal environment even though the external environment changes </li></ul>Human Body: temp-98.6 degrees F Sugar level: between 70-150 mg pH level: between 7.35-7.45 Water balance: incoming is the same or greater than outgoing Blood pressure: less than 120(mm Hg)
  3. 3. Environmental Conditions Normal: -some humidity in the air -mild temps, not cold/hot extremes throughout the day (there are seasons that they go through, so there is a period of time when it is hot and when it is cold) -natural protection from UV -water sources nearby -food source Sahara Desert: -very dry (only gets about 3 in rainfall yearly) -extreme hot/ cold fluctuations daily (extremely hot during the day, but can get very cold at night) -very little, if any shaded area -little vegetation -lack of water http://www.saharamet.com/desert/photos/dune01.jpg
  4. 4. Can You Survive in the Desert? YES, for how long depends on resources you have *Without water you can Only survive a few days -People called nomads live in the Sahara Desert *One thing that you would really want to do is save activity for cooler times of the day
  5. 5. <ul><li>Digestive System- Highly effected by dehydration. Without enough water, the digestive system cannot function properly. </li></ul><ul><li>Muscular System- This system could also malfunction without the proper amount of water. Muscles need water to work properly, without enough they will become very weak, may cramp up, and even not function at all. </li></ul><ul><li>Cardiovascular System- Dehydration can cause many problems with the cardiovascular system. Lack of water can cause heartburn and other heart pains. It can also cause hypertension, high blood cholesterol, and adult-onset diabetes. Also, when the body starts to over-heat, the blood is pulled away from essential organs to try to cool the body, which constricts the amount of blood needed for the other systems to function properly. </li></ul>Organ Systems Effected *All organ systems of the body will be effected by the hot temperatures of the desert. The body will have to adapt to these temperatures by using its natural ways of releasing heat from the body in order to keep the temperature of the organs at a normal level. The body senses that the temperature is rising, and send signals Throughout the body, this causes the pores to opens and release heat, also signals For sweat glands to moisten skin. * DRKING LOTS OF WATER AND TRY TO STAY COOL!! *
  6. 6. Adaptations <ul><li>Natural body actions are activated to cool body, for example, sweat glands are activated to moisten the skin </li></ul><ul><li>less activity in the very hot times of day to reduce loss of water </li></ul><ul><li>wear protective clothing </li></ul><ul><li>-loose fitting long sleeves and pants to protect from sun </li></ul><ul><li>-hat with wide brim </li></ul><ul><li>-sunglasses </li></ul><ul><li>-stay hydrated </li></ul><ul><li>make shelter to protect you from the sun </li></ul>http://www.caliberdt.com/~bill/arizona/desertsurvivalshelter_03.jpg http://www.hobotraveler.com/184nigerafrica2005/00510.jpg
  7. 7. Equipment <ul><li>knife </li></ul><ul><li>wood </li></ul><ul><li>blankets and other sleeping gear </li></ul><ul><li>canopies to build shelter </li></ul><ul><li>fire starters </li></ul><ul><li>proper clothing </li></ul><ul><li>shovel </li></ul><ul><li>big tarp and rope </li></ul><ul><li>bucket or large bowl </li></ul>
  8. 8. Animals of the Sahara Camels Dabb Lizard http://farm1.static.flickr.com/238/451728331_8a538b8c22.jpg?v=0 http://k53.pbase.com/o4/27/647227/1/63525090.hrL3XJZC.SaharaDabbLizard2.jpg http://www.petermaas.nl/extinct/speciesinfo/images/Gazella-dorcas-web.jpg dorcas gazelle http://travel.mongabay.com/tanzania/600/tz_1700.jpg Anubis Baboon http://www.discoverseaz.com/Graphics/Wildlife/Mammals/Kit_Fox_kittens.jpg Sand Fox
  9. 9. Plants of the Sahara <ul><li>-plants which thrive in habitats rich in salts </li></ul><ul><li>-salt marshes and sea coasts </li></ul><ul><li>-grasses </li></ul><ul><li>-shrubs </li></ul><ul><li>-trees </li></ul><ul><li>-very long roots that penetrate very deep into the earth in order to reach water and help the plant survive in the hot and dry desert conditions </li></ul><ul><li>- thick stems which help them to hold water for a very long time </li></ul><ul><li>- leaves are reduced to spines which help plants minimize water loss through the leaf stomata </li></ul><ul><li>- The common desert plants include cypress, olive, acacia and artemisia, doum palm, oleander, date palm, and thyme, while the common types of grasses include Eragrostis, Panicum, and Aristida. </li></ul>

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