Final answer:
The correct term for low blood sugar concentration is Hypoglycemia, which is dangerous as the brain depends on glucose for energy. Regulation involves the hypophyseal portal system and insulin production by the pancreas.
Step-by-step explanation:
The medical term for a low blood sugar concentration is c. Hypoglycemia. Hypoglycemia occurs when blood glucose levels fall below the normal range, which can be dangerous because the brain relies solely on glucose for energy. The hypophyseal portal system is a network that carries hormones from the hypothalamus to the anterior pituitary gland, playing a critical role in the regulation of various body functions, including blood glucose levels through the action of the hormone insulin. Insulin is produced by the beta cells of the pancreas in response to high blood glucose levels and functions to lower blood glucose levels.