Which part of the human brain controls involuntary functions like breathing and heartbeat? MCQ with Answer and Explanation

Explanation:
The inner surface of the small intestine is lined with finger-like projections called villi, which increase the surface area for absorption. The epithelial cells (enterocytes) covering these villi have their own microscopic, finger-like projections on their apical surface, called microvilli. Collectively, these microvilli form a 'brush border'. This further massively increases the surface area, maximizing the efficiency of nutrient absorption. Cilia are motile, and stereocilia are found in the inner ear and epididymis.

Explanation:
Bacille Calmette-Guérin (BCG) is a live attenuated vaccine against tuberculosis. It is given at birth in many countries. Oral polio vaccine (OPV) for polio.

Explanation:
Trypsin, a pancreatic protease, hydrolyzes proteins into peptides in the small intestine. It is secreted as inactive trypsinogen and activated by enterokinase.