500
Every cell in the body needs oxygen and nutrients in order to perform cellular functions. Which three organ systems interact to obtain, process, and transport oxygen and nutrients to all of the body's cells?
A. digestive system, endocrine system, muscular system
B. circulatory system, digestive system, respiratory system
C. circulatory system, excretory system, nervous system
D. respiratory system, nervous system, endocrine system
B