The pancreas is the primary organ responsible for regulating blood sugar levels. It produces the hormones insulin and glucagon, which help maintain blood glucose homeostasis.
- Option (1) refers to the liver, which stores and releases glucose but is not the primary regulator of blood sugar.
- Option (2) is correct: The pancreas produces insulin to lower blood sugar and glucagon to raise blood sugar.
- Option (3) refers to the kidneys, which filter blood and excrete waste, but they do not regulate blood sugar.
- Option (4) refers to the small intestine, which is involved in digestion and absorption of nutrients, not blood sugar regulation.
Thus, the pancreas is the organ primarily responsible for regulating blood sugar levels.