What system is characterized by changes in blood sugar levels and sudden changes in weight?

The endocrine system is crucial for regulating various bodily functions, including metabolism, growth, and the body’s response to stress, among others. It is primarily responsible for the production and secretion of hormones, which are chemical messengers that influence numerous physical and physiological processes.

Changes in blood sugar levels are specifically regulated by hormones such as insulin and glucagon, produced by the pancreas, a key organ in the endocrine system. Sudden changes in weight can also be attributed to hormonal imbalances or dysfunctions within this system. For example, conditions like diabetes, thyroid disorders, or adrenal gland disorders can lead to fluctuations in weight and blood sugar levels. Therefore, the characteristics described in the question—changes in blood sugar and sudden weight changes—directly align with disturbances in the endocrine system, making it the correct choice.

The other systems mentioned do not directly account for these specific symptoms. The hematologic/lymphatic system focuses on blood and immune function, the neurological system pertains to the brain and nerve function, and the psychiatric system is related to mental health disorders. None of these systems directly involve the regulation of blood sugar or weight changes in the same manner as the endocrine system.