What system uses glands to regulate body activities?

• A. Nervous system
• B. Endocrine system
• C. Muscular system
• D. Skeletal system

Answer: (B)

The body uses chemical signals released by glands to coordinate and regulate activities over time. That system, the endocrine system, sends hormones into the bloodstream that travel to distant organs and tissues to adjust processes like growth, metabolism, energy use, and reproduction. Glands such as the pituitary, thyroid, adrenal glands, pancreas, and gonads are part of this network. This approach differs from the nervous system, which uses fast electrical signals for quick, short-term changes, and from the muscular and skeletal systems, which are centered on movement and support rather than hormonal regulation.