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Extreme Deserts Final

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Transcript

  • 1. Extreme Environments: Desert Death Valley By: Natalie Wojdyla
  • 2. Homeostasis
    • Definition: the ability of a living organism to adapt to its environment. The maintenance of a stable environment.
    • Ranges: Mainstay in healthcare. Measuring the body temperature, blood pressure, heart rate, and many other variables need to be in range and is important.
    • Examples: Adult resting heart rate 60-100 beats, Adult top (systolic) number under 120 and bottom (diastolic) number below 80.
  • 3. Homeostasis
    • Examples of “normal” conditions that affect homeostasis:
    • Environmental conditions such as hot weather and humidity makes body heat up-makes people thirsty
    • Dry tropical is hottest and driest air mass- induces rapid air moisture loss from body leading to dehydration.
  • 4. Homeostasis
    • Activities to maintain homeostasis:
    • Sweating when water is removed by evaporation by heat energy to change liquid water into vapor which cools the body
    • When hot, sit down or lie down- this decreases heat production and increases heat loss to regulate body temperature.
  • 5. Physiological Adaptations
    • Dress for the heat- wear lightweight, light-colored clothing and hats/umbrellas.
    • Drink Water- keep body hydrated
    • Eat small meals- avoid foods with high protein
    • Avoid using salt tablets
    • Slow down – Avoid strenuous activities
    • Take regular breaks- Always stay cool
  • 6. Behavioral & Anatomical Adaptations
    • Never Panic:
    • Control panic by focusing the mind and operating in an organized manner
    • Adjust to the hot temperature
    • Heat can be very stressful to the body- adjust to the temperature first, and limit your physical activity until you mare accustomed to the heat
  • 7. Extreme Conditions
    • Heavy rain causes serious wildfire seasons as the dense vegetation that grew as a result of the rain dries out
    • Fire danger is very high with the high grasses and wild flowers. Very dangerous to deserts because regrowth is very slow – no rain
    • Examples: 134 degrees (f) in Death Valley, temperature might be 110, but feels like 160 degrees
  • 8. Maximum Limits
    • Humans body temp can rise to fatal levels in deserts- hyperthermia (105-107 degrees)
    • Wide Ranges of temperature, Low rainfall, intense sun and heat, Sandstorms, and mirages are all limits that humans can endure but need to be ready for.
  • 9. Organ Systems
    • Nervous System: increases sweating, Very high body temperatures can damage the brain or vital organs
    • Composition of body fluid must remain constant for cells to remain alive and healthy
    • Cardiovascular System: sends water to the skin
    • Circulatory System: As body temperature rises, the heart rate increases and blood vessels dilate to increase blood flow from the body’s core to the skin’s surface
  • 10. Proper Clothing&equipment
    • Wear light-colored, loose-fitting layers, and a hat
    • Survival kits should include:
    • Water, first aid, sharp knife, fire, soap dish container, strip magnifier, signal mirror, flint striker, small lighter, tweezers, fishhooks, sinkers, vial potassium permanganate, signal whistle, flashlight, batteries, button compass, tea bag, alcohol wipes, band aids, snare wire, needles, cords, sugar tablets, plastic bags, and many more.
  • 11. Can a human really exist here?
    • Continued exposure to excessive heat can lead to hyperthermia, heat exhaustion, heatstroke, or death.
    • Some possibilities might be muscle cramps, fatigue, headache, nausea, vomiting, dizziness, or fainting, shallow breathing, red/hot/dry skin, which all could lead to encephalopathy, liver and kidney failure, coagulopathy, and multiple organ system dysfunction
  • 12. The End!