The Human Body [exclusive]

Voluntary muscles attached to bones that facilitate conscious movement.

While the nervous system uses rapid electrical signals, the endocrine system manages long-term regulation using chemical messengers called hormones. Secreted by glands such as the pituitary, thyroid, and adrenals, hormones travel through the bloodstream to regulate metabolism, growth, sleep cycles, and stress responses. 5. Defense and Maintenance The Human Body

Perhaps the most underrated system, the immune system distinguishes "self" from "non-self" with terrifying accuracy. White blood cells hunt, kill, and remember pathogens. Every day, your body destroys thousands of cancerous cells before they become tumors. and remember pathogens. Every day