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Parasites, in general, are gruesome creatures. They can be found all over the world and in almost every living thing; they live inside their host and feed off of them in various ways. Some parasitology is essential to understand in order to prevent and/or heal infections caused by these little critters. This article will evaluate parasites, what they do when healthy, how they infect their hosts, how to protect yourself from them once they've made their way inside you (and eaten you), and what steps you can take when one has invaded your body (including the importance of knowing which type of parasite it is). Meet your new best friends: parasites. These creepy little beasts can be found in most tropical and subtropical environments. The best way to describe them is to say they exist in a delicate balance between their host and the surrounding environment. Parasites come in a wide variety of shapes and sizes, from the smaller viruses that attack bacteria, to the larger tapeworms that can live inside humans (and other animals). Some like hookworms like to live in the digestive tract while others like schistosomes like to hide out in your intestines; many prefer your blood while others enjoy living inside your liver; some even enjoy taking up residence in your kidneys, muscles, or joints. It is very interesting to note that as terrible as these creatures may seem, they all serve a purpose. Parasites aren't the only ones who can cause problems; many other infectious agents or pathogenic bacteria and viruses can do the same. What we need to take away from this is that we should not be so quick to judge whether something is good or bad - after all, aren't we all simply trying to survive and make a living? These organisms will never go away, but society has found ways of treating, preventing, and even controlling them. Some parasites have been discovered in fossils from prehistoric times showing how "primitive" life was exposed to these little pests for millions of years. Parasites can come in many different shapes and sizes, but they all have the same basic anatomy. First, parasites are broken down into two categories based on whether or not they can move on their own or not. A motile parasite is any organism that has the ability to move around by itself (unlike viruses which are simply "hitchhikers"). This includes many worms like hookworms, roundworms, and tapeworms. Some swim using flagellae (the "wheel" found in jellyfish that propels them through the water), while others walk using tiny legs called pseudopods (leg-like structures used by amoebas). A non-motile parasite is one that doesn't have the ability to move about by itself. This includes many bacteria, fungi, and protozoans. The next major classification is based on their internal architecture. There are two different classifications of parasites - internal and external. An internal parasite has its "house" in the tissues of its host while an external parasite has its home elsewhere in the body (sometimes inside or outside). Bacteria are considered nonmotile cellular parasites while viruses are considered nonmotile genetic parasites. There are also parasites that do not fit neatly into any one category; they can be described as both internal and external at the same time. cfa1e77820
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