what you know about pathogens and protection. You can use the additional resources .  Then design an information poster or brochure to help  the public understand how their body has defense mechanisms in place against invading pathogens. Be creative but accurate and engaging. Decide who the audience is and make the media relevant and accessible to the audience. 
1.  How does clotting protect us?  
 2.  What is the role of mucous membranes, cilia, tears 
 3.  What are the function of sebaceous and sweat glands 


David Evans

Natural Sciences
Penn College/PSU
Williamsport, PA

Part I: July 13th, AM

Mark, a white, 35-year-old male weighing approximately 70 kilogram (kg) started a three-hour drive
across the desert on US 95 from Yuma, Arizona, to Blythe, California. He set out at 7 AM on what was
expected to be a very hot July day. He anticipated that it would take him about three hours to reach
Blythe—plenty of time to make his 11 AM appointment with Sarah, his fiancée. When he failed to
appear by noon, Sarah became concerned and called the highway patrol.

By 12:30 PM, Search and Rescue Officer Maria Arroyo, who was patrolling nearby, reported finding an
abandoned car on the side of the road with a damaged radiator that matched Sarah’s description of
Mark’s vehicle. Maria noticed shoe prints leading into the desert toward some low mountains in the
distance. At that point Maria called for helicopter assistance, consulted her GPS, and relayed the exact
coordinates to base.

By 1 PM Henry Morningstar, paramedic and a member of the helicopter crew, reported a shirtless,
hatless man wandering down a desert wash. The local radio station reported at about the same time that
the air temperature was hovering at 105° F in the shade (and there was darned little of that). The relative
humidity was less than 5%. The helicopter crewmembers spotted a man staggering on the desert. They
realized they had found Mark. His driver’s license identified him as the missing man. Mark was still
conscious but clearly delirious. Henry also noted that Mark was weak, nauseous, disoriented, and
complained of a headache. His blood pressure was quite low—70/50—and he was not sweating despite
the oppressive heat. His body temperature was also high—105°. The patient was diagnosed as having
heat stroke. The paramedic also noted first degree burns on his face and back.

Suddenly, Susan Liu, the pilot, reported that they had lost radio contact with the hospital. It was all up to
Henry now!

Given the conditions, what should Henry do to try to save Mark? He must decide very quickly.
Mark has very little time left and may not survive the trip by helicopter to the hospital. Gather
into your groups and use your textbooks as resources to gather for information about what
Henry should do. What has caused Mark’s weakness, nausea, disorientation, headache, and low
blood pressure? Why isn’t he sweating?


Part II: July 13th, PM

Henry started oral rehydration with an isotonic solution containing electrolytes, glucose, and water.

Why didn’t the paramedic give Mark distilled water rather than an electrolyte/glucose solution?

As Mark recovered in the hospital, he related what happened to him earlier in the day. Since he was a
newcomer to desert areas, he saw no need to bring UV A/B sunblock or extra water on his trip from
Yuma to Blythe. Mark recalled seeing a coyote dart out betwe

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