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A parasite is an organism that derives nutrition from other living organisms, generally in such a way as to cause disadvantage but not death to the victim. The term also usually implies a long-term association, and/or that the "parasite" is smaller than the "". are excluded, even though they would often fall under the coverage of the first definition ( are not regarded as parasites of ).

Parasites are generally divided between , which live within the host, and , which live outside the host. Endoparasites may be further divided according to where exactly they can be found, whether in the , , etc. Ectoparasites may differ between those that are permanently associated with the host (such as ) or those that only approach the host to feed (such as ). The adaptations associated with all these categories can differ significantly. Many parasites, particularly endoparasites, show a reduction or loss of features found in their free-living relatives, and rely on the host for the functions these features previously performed. Many parasites are often very host-specific, and many endoparasites have complicated life-cycles with different stages having different hosts.

Because most parasites are soft-bodied and have restricted habitats, most parasitic have very little fossil record.

A great many different organisms have become parasites varying from to some such as , and it would not be possible to enumerate them all. However, some notable examples are listed below:

: Many bacteria are known for causing diseases, such as (tuberculosis) and (syphilis). Many bacteria and fungi are - that is, they normally live on the host as and only become parasitic if the host has been otherwise compromised.

: "Protozoa" include many parasitic clades such as , and , some members of which are significant disease organisms for humans.

: A number of plants are parasitic, generally on other plants. Plant parasites may be distinguished between such as , which retain their own and only derive some of their nutrition from the host, and such as , that derive their nutrition entirely from the host.

: Notable examples of parasitic fungi are the (intracellular parasites only recently recognised as fungi) and members of (the rusts).

: Among the countless examples of parasitic animals are the , , parasitic such as and , such as many , and such as and . Many and lay eggs within other insects - technically, these insects are , as unlike true parasites the larva usually causes the death of the host.


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SUNDAY, Dec. 30 (HealthDay News) -- If heart disease, stroke and certain cancers haven't been reason enough for men to quit smoking, consider this: The habit also increases the risk of erectile dysfunction. The researchers at the Chinese University of Hong Kong believe that the root cause of both the erectile problems and the heart disease could be down to blood vessel damage caused by high blood sugar levels. They advise men who have impotency problems to see their doctor, as this appears to be a reliable warning sign of future health problems. Author cotributions A pump, which draws air out of the cylinder; and The meatus, the opening at the tip of the head where urine and semen are discharged. Treating Depression Potential Conflicts of Interest: Grants received: V. Snow (Bristol-Myers Squibb, Centers for Disease Control and Prevention, Novo Nordisk, Merck Vaccines, Boehringer Ingelheim, Wyeth, Sanofi Pasteur), P. Shekelle (Pfizer). Royalties: P. Shekelle (Up-to-Date). Any financial and nonfinancial conflict of interest of the group members were declared, discussed, and resolved. Buy Viagra Online Arthritis was the most common reason for NSAID use, and for men with arthritis the corresponding rates of erectile disorder were 97 and 52 per 1000 person-years. Erectile Dysfunction Medication Cialis, Levitra, and Viagra work by a similar mechanism to cause erections. There are subtle differences in how long the drug works and how quickly it works. Levitra works a little longer than Viagra. They both take effect in about 30 minutes. With Levitra, the effects last for about 5 hours. With Viagra, the effects last approximately 4 hours. Is male infertility treatable? The bite from the Brazilian wandering spider (Phoneutria nigriventer) causes a painful erection that can last for many hours and later lead to impotence, researchers from the United States and Brazil noted. It wasn't the ads that prompted Gao to undertake this work, and no drug companies were involved in the federally-funded study. Gao told Reuters Health that his team had noticed that both conditions seem to involve dopamine, an important message-carrying chemical, or neurotransmitter. "Actually, it is psychological distress associated with not measuring up rather than physiological problems that causes most sexual dissatisfaction," Shaw says. "For many, many men -- maybe most -- problems with sex are due to ignorance, anxiety, and inability to communicate with their partners. I think sexual dysfunction is the inevitable result of the effort to attain perfection." Men are sterilized with a vasectomy. The man's vas deferens (sperm ducts) are closed off so sperm can't get through. The management of angina in patients who have taken sildenafil within 24 hours involves the use of non-nitrate antianginal drugs such as beta blockers. The use of heparin, narcotics, aspirin or calcium channel blockers for acute coronary artery syndromes is not contraindicated. If nitrates are inadvertently administered to a patient who has taken sildenafil and hypotension occurs, aggressive fluid resuscitation with the patient in the Trendelenburg position is the first step. An intravenous alpha-adrenergic agonist (phenylephrine) or an alpha- and beta-adrenergic agonist (norepinephrine) can be given if needed to support blood pressure. An intra-aortic balloon counterpulsation pump can be used if pharmacologic measures are ineffective.19

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