An Exchange Surface in Direct Contact with the External Environment

Question

An exchange surface in direct contact with the external environment is found in the
A) lungs.
B) skeletal muscles.
C) liver.
D) heart.
E) brain.

Accepted Answer

Lungs have exchange surfaces in direct contact with the external environment which allows the exchange of gases between the environment and the circulatory system. Skeletal muscles, liver, heart, and brain do not have exchange surfaces in direct contact with the external environment.