Which of the following is a steroid hormone? MCQ with Answer and Explanation

Explanation:
Typhoid fever is a life-threatening systemic infection caused by the bacterium Salmonella typhi. It is transmitted through contaminated food and water. Symptoms include sustained high fever, headache, abdominal pain, and sometimes a rash. The Widal test is a common diagnostic test for typhoid. S. pneumoniae causes pneumonia, and V. cholerae causes cholera.

Explanation:
Plasma makes up ~55% of blood; albumin is the main protein. Mature human RBCs are anucleate. So 3 is incorrect.

Explanation:
Ghrelin is a peptide hormone produced mainly by the endocrine cells of the stomach, especially when it is empty. It is often called the 'hunger hormone' because it acts on the arcuate nucleus of the hypothalamus to stimulate appetite (orexigenic effect) and promote food intake. Ghrelin levels rise before meals and fall after eating. It has the opposite effect of leptin, which suppresses appetite.