Which organ system is not functional until birth and must become fully functional immediately?
A) excretory system (kidneys)
B) respiratory system
C) cardiovascular system
D) muscular system
E) skeletal system

Question

Quizplus · Accepted Answer

The respiratory system is not functional until birth because the fetus receives oxygen through the placenta. It must become fully functional immediately after birth for the newborn to breathe independently.

Which Organ System Is Not Functional Until Birth and Must