Question

blood transports hormones around the body. hormones are... waste created by cells during cellular respiration. chemical messengers that regulate and signal lots of body processes. nutrients that cells use in cellular respiration. chemical compounds that regulate only the heartbeat.

Explanation:

Hormones are chemical messengers secreted by endocrine glands. They travel through the bloodstream to target cells and regulate various physiological processes such as growth, metabolism, and reproduction. They do not function as waste, nutrients for cellular respiration, or only regulate the heartbeat.

Answer:

chemical messengers that regulate and signal lots of body processes.