Tag: biology

Most people exposed to the cholera bacterium (Vibrio cholerae) do not become ill and never know they've been infected. Yet, because they shed cholera bacteria in their stool for seven to 14 days, they can still infect others through contaminated water. Most symptomatic cases of cholera cause mild or moderate diarrhea that's often hard to distinguish from diarrhea caused by other problems. Symptoms of cholera infection may include diarrhea, nausea and vomiting, dehydration. 

Sir Ronald Ross discovered the malarial parasite in the gastrointestinal tract of mosquito and led to the realization, that malaria was transmitted by mosquitoes. He received the Nobel Prize in 1902 for his work on malaria. 
Thus, the correct answer is option C.

Ronald Ross is known for his work on malaria. He worked and discovered malarial parasite in Secunderabad near Begumpet airport and that site is declared as 'Sir Ronald Ross Road'.
Thus, the correct answer is option C.

Cholera is the infection of the small intestine and is caused by the bacterium, Vibrio cholerae. The hallmark of the disease is profuse secretory diarrhoea. So, the patients with cholera are administered by saline drip or NaCl as the sodium ions or Na ions helps in retaining the water.
Therefore, the correct answer is option B.

Patients suffering from cholera are given a saline drip because Na+ ions help in the retention of water in the body tissues. Severe diarrhea, vomiting, watery stools are the chief symptoms of cholera. All these lead to dehydration. Actually, cholera toxin secreted by Vibrio cholerae causes, through a series of metabolic reactions, the continuous activation of adenylate cyclase of intestinal epithelial cells. The resultant high concentration of c-AMP triggers continuous secretion of chlorine, bicarbonate, and water into the lumen of the intestine. Administration of saline not only supports the sodium-potassium pump through which water in the cell is restored, but glucose is also imported along with sodium. Thus, the correct answer is option D.

Cholera is an intestinal infection caused by eating and drinking contaminated food and water with the Vibrio cholerae. It is characterized by diarrhea and dehydration. This infection can ve prevented by the use of boiled water, cook food well and keep it covered and maintaining personal and public hygiene. Thus, the correct answer is option A.

Cholera is caused by a bacterium called Vibrio cholerae. A person gets cholera by drinking water or eating food infected with the bacterium. Once swallowed, it settles in the lining of the small bowel and releases a toxin (poison) that can cause the body to flush liquid into the small bowel, resulting in watery diarrhoea. The main symptom is watery diarrhoea, which can be severe enough to rapidly drain the body of vital water, salts and minerals. The first watery stool appears 1 to 3 days after infection, and from then on the body can lose up to one litre of liquid an hour. 

Sir Ronald Ross discovered the malarial parasite in the gastrointestinal tract of mosquito and led to the realization, that malaria was transmitted by mosquitoes. He received the Nobel Prize in 1902 for his work on malaria.