Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Thyroid hormones and insulin maintain blood glucose concentration during fasting.

Verified step by step guidance

1. Step 1: Begin by analyzing the role of thyroid hormones in blood glucose regulation. Thyroid hormones primarily regulate metabolism and energy production but do not directly maintain blood glucose concentration during fasting.
2. Step 2: Examine the role of insulin in blood glucose regulation. Insulin lowers blood glucose levels by promoting glucose uptake into cells and storage as glycogen, but during fasting, insulin secretion is reduced.
3. Step 3: Identify the hormones responsible for maintaining blood glucose concentration during fasting. Glucagon and cortisol are the primary hormones involved in increasing blood glucose levels during fasting by stimulating glycogen breakdown and gluconeogenesis.
4. Step 4: Determine the accuracy of the statement. The statement is false because thyroid hormones and insulin are not the primary regulators of blood glucose during fasting.
5. Step 5: Correct the false statement. A true statement would be: 'Glucagon and cortisol maintain blood glucose concentration during fasting.'

Key Concepts

Thyroid Hormones

Thyroid hormones, primarily thyroxine (T4) and triiodothyronine (T3), play a crucial role in regulating metabolism, energy production, and overall growth. While they influence various metabolic processes, they do not directly maintain blood glucose levels during fasting. Instead, their primary function is to increase the basal metabolic rate and support the body's energy needs.

Insulin

Insulin is a hormone produced by the pancreas that regulates blood glucose levels by facilitating the uptake of glucose into cells, particularly after meals. During fasting, insulin levels decrease, which allows blood glucose levels to rise as the body utilizes stored energy. Therefore, insulin does not maintain blood glucose concentration during fasting; rather, it acts to lower it when food is consumed.

Blood Glucose Regulation

Blood glucose regulation involves a complex interplay of hormones, including glucagon, cortisol, and epinephrine, which work to maintain glucose levels during fasting. Glucagon, produced by the pancreas, increases blood glucose by promoting glycogen breakdown and gluconeogenesis in the liver. This process is essential for providing energy to the body when food intake is low, contrasting with the roles of thyroid hormones and insulin.