Optometry Admission Test (OAT) Practice

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Prepare for the Optometry Admission Test effectively. Explore flashcards, multiple-choice questions with in-depth explanations. Excel in your exam!

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What is the primary function of insulin?

Increases blood glucose levels
Decreases glycogen storage
Lowers blood glucose levels
Stimulates glucagon release

The correct answer is: Lowers blood glucose levels

Insulin plays a crucial role in regulating blood glucose levels, and its primary function is to lower these levels when they are elevated, such as after a meal. When we consume food, especially carbohydrates, glucose is released into the bloodstream. In response to this increase in blood glucose, the pancreas secretes insulin. Insulin facilitates the uptake of glucose by cells, particularly muscle and adipose (fat) cells, allowing them to use glucose for energy or store it for later use. Additionally, insulin promotes the conversion of glucose into glycogen, which is stored in the liver and muscle cells, further reducing glucose levels in the bloodstream. This mechanism is vital for maintaining homeostasis and preventing hyperglycemia (high blood glucose levels). Therefore, the option stating that insulin lowers blood glucose levels accurately reflects its primary function within the body’s metabolic processes.