Describe the causes, symptoms, and effects of heat exhaustion
What will be an ideal response?
Heat exhaustion is a state of collapse, usually manifested by fainting, that is caused by reduced blood pressure brought about as a result of overtaxing the heat-loss mechanisms. Extensive sweating reduces cardiac output by depleting the plasma volume, and pronounced skin vasodilation causes a drop in total peripheral resistance. Because blood pressure is determined by cardiac output times total peripheral resistance, blood pressure falls, an insufficient amount of blood is delivered to the brain, and fainting takes place. Thus, heat exhaustion is a consequence of over-activity of the heat-loss mechanisms rather than a breakdown of these mechanisms.
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"A refractory period occurs following all types of potentials." Is this statement TRUE or FALSE? What structures are actually refractory? Why or why not?
What will be an ideal response?
Define the underlined terms in the following case study. The clinic admitted for observation a Rattus rattus specimen believed to have been domesticated following research use. According to the owner, the rodent, which was an albino, had been having difficulty acclimatizing. In addition, the owner expressed concern that, despite its former axenic surroundings, the specimen was a vector arising
from its laboratory use. What will be an ideal response?
Vesicles differ from vacuoles in that vesicles are usually produced for the purpose of causing something to leave the cell.
a. true b. false
Hypersensitivity is usually caused by _________.
A. a complete antigen B. bacterium C. a hapten D. a virus