Which hormone acts on multiple tissues to promote protein synthesis?

The hormone that acts on multiple tissues to promote protein synthesis is growth hormone. It plays a critical role in stimulating growth, cell reproduction, and regeneration in the body. Growth hormone exerts its effects by binding to receptors on various tissues, particularly muscle and bone, which leads to an increase in the synthesis of proteins. This is essential for growth and development during childhood and adolescence, but it also supports metabolic functions in adults by enhancing muscle mass and reducing fat mass.

Additionally, growth hormone promotes the release of insulin-like growth factor 1 (IGF-1) from the liver, which further aids in tissue growth and protein synthesis, making its effects widespread across different body tissues. This multifaceted role in promoting an anabolic environment helps in muscle repair and growth after exercise, and it facilitates overall body composition improvements, making it a key hormone for those looking to enhance physical performance or recover from injuries.