Blood volume. If you are tired and no blood is able to get to your body and you heart keeps going faster your heart is probably going to fail.
90 degrees because you can increase the risk of a heat related illness.
Hope this is useful :D
Epithelial tissue covers the body surface and forms the lining for most internal cavities. The major function of epithelial tissue includes protection, secretion, absorption, and filtration. The skin is an organ made up of epithelial tissue which protects the body from dirt, dust, bacteria and other microbes that may be harmful. Cells of the epithelial tissue have different shapes as shown on the student's worksheet. Cells can be thin, flat to cubic to elongated. Cited from: https://www.msnucleus.org/membership/html/k-6/lc/humanbio/4/lchb4_3a.html
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A clavicle fracture is a break in the collarbone. You have two clavicles, each connecting a shoulder to the upper chest. Broken collarbones are common, often happening from a fall, sports injury or car accident. Although a broken clavicle is painful, most people don't need surgery.
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