Consider the following statements about the blood: 1. Plasma is about 55% of blood volume. 2. Albumin is the most abundant plasma protein. 3. Red blood cells have nuclei in humans. Which of the above is/are correct? MCQ with Answer and Explanation

Explanation:
Vitamin A is essential for the formation of rhodopsin in the retina; its deficiency causes night blindness. Vitamin B1 (thiamine) deficiency leads to beriberi, characterized by nerve and heart issues. Vitamin K, not Vitamin C, is essential for the synthesis of blood clotting factors like prothrombin. Vitamin C is essential for collagen synthesis and immunity. Thus, statements 1 and 2 are correct.

Explanation:
Salivary glands secrete saliva containing salivary amylase (ptyalin) which begins starch digestion. The stomach's gastric glands secrete HCl, creating an acidic medium for pepsin action. Bile is synthesized continuously by the liver, stored, and concentrated in the gall bladder, but not produced by it. Therefore, statements 1 and 2 are correct, while 3 is false.

Explanation:
G.H.A. Hansen discovered Mycobacterium leprae in 1873, the first bacterium identified as causing a human disease. Koch later discovered TB.