When increased blood glucose levels stimulate increased secretion of insulin, this is an example of control by:

Choice A reason: Type 1 diabetes cannot be treated with oral glycemic agents. These medications are typically used to manage type 2 diabetes, which is characterized by insulin resistance rather than a lack of insulin production. In type 1 diabetes, the pancreas is unable to produce insulin due to an autoimmune destruction of insulin-producing beta cells. Therefore, individuals with type 1 diabetes require insulin therapy to manage their blood glucose levels effectively.

Choice B reason: Type 1 diabetes has a definite genetic component, though it is not solely determined by genetics. A combination of genetic predisposition and environmental factors, such as viral infections or other autoimmune triggers, can lead to the development of type 1 diabetes. Certain genes, including those in the HLA region, are known to increase susceptibility to the disease.

Choice C reason: In type 1 diabetes, the pancreas is indeed completely unable to produce insulin. This is due to an autoimmune attack on the beta cells of the pancreas, which are responsible for insulin production. Without insulin, the body cannot regulate blood glucose levels, leading to hyperglycemia and the need for exogenous insulin administration.

Choice D reason: Type 1 diabetes often has an acute onset, particularly in children and young adults. Symptoms can develop rapidly over a few days to weeks, including increased thirst, frequent urination, unintended weight loss, and severe fatigue. This acute presentation is a hallmark of the disease and contrasts with the more gradual onset seen in type 2 diabetes.

Choice A reason: Low white blood cell (WBC) count is not related to the development of diabetes. WBCs are part of the immune system and are involved in fighting infections. Diabetes is primarily associated with issues related to insulin, either its production or the body's response to it.

Choice B reason: Lack of insulin secretion is a primary cause of type 1 diabetes. In type 1 diabetes, the body's immune system attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body cannot produce insulin, leading to high blood glucose levels. Insulin therapy is required to manage blood glucose levels in individuals with type 1 diabetes.

Choice C reason: Low red blood cell (RBC) count, or anemia, is not a cause of diabetes. RBCs are responsible for carrying oxygen throughout the body. While anemia can occur in individuals with diabetes due to various complications, it is not a direct cause of the condition.

Choice D reason: Resistance to insulin is a primary cause of type 2 diabetes. In type 2 diabetes, the body's cells become resistant to the effects of insulin, making it difficult for glucose to enter the cells. As a result, the pancreas produces more insulin to compensate, but eventually, it cannot keep up with the demand, leading to high blood glucose levels. Lifestyle changes, oral medications, and insulin therapy are often used to manage type 2 diabetes.