The Body 's Defence Against Infectious Disease

1038 WordsMay 16, 20155 Pages
Honors Biology Homework: Chapter 24 - Reading Objectives (20 pts.) Name: Hunter Marshall Period: A Innate Defenses 1. Describe and compare the external and internal innate defenses that protect us from microbes and other substances that could invade and harm the body. Answer: The Immune system is the body’s defence against infectious disease Our bodies defend us against pathogens, disease- causing viruses and microorganisms. The human body contains two lines of defence. External barriers and internal defenses both are Innate defenses fully ready to respond before and invader has been encountered. Adaptive defenses are a third line of defense, activated by exposure to specific invaders, the body has physical barriers including, a tough outer skin layer generally impenetrable to viruses and bacteria, mucous membranes covered with sticky mucus wax in the ear canal, which traps particles before they can get deep inside. secretions such as tears sweat or saliva with antimicrobial chemicals and strong stomach acids that kill most pathogens ingested with food. 2. Describe the inflammatory response, the role of histamine, and the effects of drugs such as aspirin and ibuprofen. Answer: The defensive proteins that aid in internal innate defenses work indirectly and directly interferons indirectly help healthy cells resist damage complementary proteins attack pathogens directly. Another example of an internal innate defense is the inflammation response. Damaged

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