Final answer:
Individuals with type 1 diabetes are dependent on insulin injections because their pancreas cannot produce enough functional insulin, making them unable to properly regulate blood sugar levels.
Step-by-step explanation:
A person with type 1 diabetes mellitus is indeed dependent on insulin. This is because in type 1 diabetes, the pancreas is unable to produce sufficient insulin due to the destruction of the insulin-secreting beta cells. The lack of insulin production leads to an inability to regulate blood glucose levels properly. To compensate for this deficiency, individuals with type 1 diabetes must administer insulin through injections or pumps to maintain their blood sugar levels within a normal range. As such, the answer to the question is A. True.
Type 1 diabetes, often diagnosed in children and young adults, is a chronic autoimmune condition. The immune system mistakenly attacks and destroys the pancreatic beta cells, preventing them from producing insulin. Without insulin, the body cannot effectively take up sugar from the blood to use as energy, leading to high blood sugar levels. Therefore, insulin therapy is a lifesaving treatment for people with type 1 diabetes, as it allows them to respond to elevated blood glucose levels, a stimulus they would otherwise be unable to regulate due to the lack of endogenous insulin production.