Homeostasis describes the stable environment that the human body maintains, enabling the body to function properly. When an outside stimulus threatens to disrupt homeostasis, body systems work to bring things back into balance. Which of the following directly describes systems working together to maintain homeostasis? A. The circulatory system moves waste products from the stomach to the excretory system.
B. The nervous system senses cold temperatures and causes muscles to contract and relax rapidly.
C. The respiratory system releases hormones to regulate the immune system and fight germs in the body.
D. The digestive system releases heat as it digests food, which the circulatory system spreads throughout the body.