Final answer:
The regulation of hormone levels in the body is not achieved through digestion in the small intestine but rather through negative feedback loops, metabolism in the liver, and filtration by the kidneys. The Correct Answer is Option.C.
Step-by-step explanation:
The correct answer to the question of which method is not a way that hormone levels are regulated in the body is (C) Digested in small intestine. Hormones are typically not digested for regulation, as digestion is the breakdown of food to allow for nutrient absorption. Instead, hormones are commonly regulated by (A) Negative feedback loops, which serve to maintain hormone levels within a specific range to ensure homeostasis. Additionally, hormones can be (B) Metabolized in the liver, where they are chemically altered and prepared for excretion, or (D) Filtered out by the kidneys, where excess hormones can be removed from the blood and excreted in urine.
Negative feedback loops are the more common method of hormone regulation, where the increase in a specific hormone triggers a response that reduces its own production, maintaining the levels within a narrow range. This principle is illustrated by how the hypothalamus and pituitary gland regulate the secretion of the adrenal hormone corticosteroids, and by the mechanism that controls thyroid hormone levels.