The main function of the large intestine is: MCQ with Answer and Explanation

Explanation:
Cortisol, from the adrenal cortex, is a glucocorticoid that increases blood glucose, suppresses inflammation, and aids the body's adaptation to prolonged stress. Adrenaline is for acute stress, thyroxine metabolism, insulin glucose.

Explanation:
Bones store minerals (1) and contain marrow for hematopoiesis (2). Ligaments connect bone to bone; tendons connect muscle to bone. So 3 is incorrect.

Explanation:
Pulmonary surfactant is a complex mixture of lipids (primarily dipalmitoylphosphatidylcholine) and proteins secreted by Type II alveolar cells (septal cells) in the lungs. Its primary function is to reduce the surface tension of the fluid lining the alveoli. Without surfactant, the alveoli would collapse at the end of expiration (atelectasis) due to high surface tension, making it extremely difficult to re-inflate the lungs during inspiration.