Thyroxine, secreted by the thyroid gland, primarily regulates: MCQ with Answer and Explanation

Explanation:
Cerebrospinal fluid (CSF) is a clear fluid produced by the choroid plexus in the ventricles of the brain. It cushions the CNS, provides buoyancy, removes waste, and maintains chemical stability. Synovial fluid is in joints, pleural fluid in chest cavity, lymph in lymphatic vessels.

Explanation:
Glycolysis, the breakdown of glucose to pyruvate, occurs in the cytoplasm of cells. The Krebs cycle and oxidative phosphorylation occur in mitochondria.

Explanation:
Vitamin A (retinol) is essential for the synthesis of rhodopsin (visual pigment in rod cells) and maintenance of epithelial tissues. Deficiency causes night blindness (nyctalopia), xerophthalmia, and ultimately permanent blindness. Bone development is related to vitamin D and calcium. Blood clotting is vitamin K, energy metabolism involves B vitamins. Thus, vision is primarily affected.