The two systems with related functions that will change the most rapidly at birth, but that are still undergoing some differentiation shortly before birth, are the circulatory and ________ systems.
A) cardiovascular
B) integumentary
C) reproductive
D) digestive
E) respiratory

Question

Quizplus · Accepted Answer

The circulatory and respiratory systems are related in that the former delivers oxygenated blood to the body's tissues, and the latter is responsible for the exchange of gases between the air and blood. At birth, the infant transitions from receiving oxygen from the placenta to breathing on its own, and the circulatory system must adapt to this new source of oxygen. The respiratory system, in turn, must also adjust to the outside environment and begin to function independently. However, these systems are still undergoing some degree of differentiation shortly before birth. The other systems listed - cardiovascular, integumentary, reproductive, and digestive - are either not directly related to the circulatory system or undergo less significant changes at birth.

The Two Systems with Related Functions That Will Change the Most