Which of the following pairs of body system primarily regulate the activities of the other systems?

The nervous and endocrine systems are the body systems that primarily regulate the activities of the other systems. • Nervous system: This system uses electrical signals (neurotransmitters) to communicate quickly and control various bodily functions, including muscle contractions, sensory perception, and organ function. • Endocrine system: This system uses chemical messengers (hormones) to regulate slower, long-term processes like metabolism, growth, reproduction, and mood.