Which of the following metabolic processes is stimulated by thyroid hormones?

Thyroid hormones play a significant role in regulating metabolism within the body. They generally enhance metabolic activity, particularly in the processes related to energy production and utilization. Among the processes listed, glycogenolysis is critical because it involves the breakdown of glycogen into glucose, thereby increasing the availability of glucose in the bloodstream. This process is particularly important during times of energy demand, such as physical exercise or fasting.

The stimulation of glycogenolysis by thyroid hormones contributes to a higher metabolic rate, aiding in the mobilization of energy. When thyroid hormone levels are elevated, the body is more efficient at converting stored glycogen into usable glucose. This effect is crucial for maintaining energy homeostasis and supporting overall metabolic function.

The other processes listed, while important for overall metabolism, either do not reflect the stimulatory role of thyroid hormones as directly or pertain more to energy storage rather than mobilization. For instance, glycogenesis is the formation of glycogen from glucose, which is not typically stimulated by thyroid hormones. Fatty acid synthesis, primarily a storage process, is also not the primary focus of thyroid hormone action, which tends to lean towards facilitating energy availability. Protein synthesis does occur as a result of various hormonal actions, but it is not