bugs2 - Chapter 7: What is a parasite? How is different...

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Chapter 7: What is a parasite? How is different from a predator? Animal that obtains its nutrition at the expense of another organism. Unlike predators, they usually do not kill their hosts What common features do ectoparasites share? gradual development; live externally on host bodies; external structures are protection from host; two dimensional (compressed laterally or flattened dorso-ventrally); thick/tough cuticle; reduced wings or none; backwards-pointing spines or combs in strategic places What is an obligate parasite? Parasite with sucking mouthparts; cannot live independently of host What two groups of mammals do not have parasites? Cetaceans (whales and dolphins) and seacows (manatees) and scaly pangolins What is one theory about the development of the opposable thumb in humans that has to do with parasites? It is said that they developed to fill the need for social grooming What is a vessel feeder? How about a pool feeder? Parasite that takes blood directly from small veins or venules. Pool feeders use their mouthparts to rip and tear through tissue and cause profuse bleeding. They then lap up the blood as it flows How do strict blood feeders avoid vitamin deficiencies? By housing mutualistic microorganisms that produce vitamins that are short in supply What is dermatosis and what causes the condition? When parasites literally get under the skin What is myiasis? Infestation of an open wound on a living host What are lidocane and mineral oil used to extract from people? cockroaches What insect’s sting causes the most human deaths? hymenopterans (bees, ants, wasps) What is envenomization? process by which venom is injected into some animal/human by bite or sting What are urticating hairs? stinging hairs that insert themselves under the skin and insert venom What is in venom? enzymes that break down proteins and cell membranes, as well as compounds that mimic the action of neurotransmitters What one insect do 75% of asthmatic children show sensitivity to? Cockroach parts What are nits? Eggs of lice What is a cootie?
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Body louse What is pediculosis? Body louse infestation What is a rickettsia? a tiny organism intermediate in its biology between bacteria and viruses What loss did Joachim of Brandenburg suffer? lost 30,000 to typhus What finally stopped Napoleon’s army? typhus What did Charles Nicolle discover in 1907? that the transmission of rickettsia is by lice
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bugs2 - Chapter 7: What is a parasite? How is different...

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