Final answer:
Thyroid hormones increase carbohydrate metabolism, overall metabolic activity, gluconeogenesis, and oxygen consumption, which relates to choices I, II, III, and IV. They do not cause cold intolerance or decrease blood pressure; thus, V and VI are not correct.
Step-by-step explanation:
The functions of thyroid hormones include several physiological processes crucial to the body's metabolism. Specifically, thyroid hormones play a key role in increasing carbohydrate metabolism, enhancing metabolic activity, promoting gluconeogenesis (the production of glucose from non-carbohydrate substrates), and raising the rate of oxygen consumption. The presence of thyroid hormones leads to an increased metabolic rate, which is associated with higher oxygen consumption and body heat production.
On the other hand, thyroid hormones do not cause cold intolerance; in fact, they typically generate heat and help maintain body temperature. Likewise, rather than decreasing blood pressure, the hormones increase the rate and force of the heartbeat, potentially affecting blood pressure.
Therefore, the hormones are directly responsible for functions I, II, III, and IV, but not V and VI. The correct answer to the question, which of the following are functions of thyroid hormones, with choices I through VI, would be (D) I, II, III, and IV only.