The hormone insulin is produced by which cells of the pancreas?
A. Acinar cells
B. Beta cells
C. Alpha cells
D. Delta cells
Answer: Option B
Solution (By JKSSB Mock Tests)
Beta cells of the islets of Langerhans secrete insulin, which lowers blood glucose. Alpha cells secrete glucagon (raises glucose), delta cells somatostatin, and acinar cells produce digestive enzymes.
Explanation:
Leprosy (Hansen's disease) is a chronic bacterial infection caused by Mycobacterium leprae, affecting skin, peripheral nerves, and mucous membranes. Tuberculosis is caused by M. tuberculosis. Diphtheria is Corynebacterium diphtheriae, plague is Yersinia pestis. Leprosy is curable with multidrug therapy.
Explanation:
The Widal test is a serological agglutination test used to diagnose enteric (typhoid) fever, caused by Salmonella enterica serotype Typhi. It detects the presence of specific antibodies (O and H antigens) in the patient's serum against the O (somatic) and H (flagellar) antigens of the Salmonella typhi bacteria. A significant rise in antibody titer indicates an active or recent infection. It is not used for TB (Mantoux test), malaria (blood smear), or dengue (NS1/IgM).
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