Why is there no need for insects to have a cardiovascular system to allow for gas exchange?

Question

Quizplus · Accepted Answer

Insects have a tracheal system that allows for direct gas exchange between the atmosphere and muscle cells. Carbon dioxide and oxygen are exchanged directly at the muscle cells, and diffusion of gases occurs with the air directly. Therefore, there is no need for a cardiovascular system for gas exchange. Option A and B are correct, while option C is incorrect, as insect cells do conduct aerobic respiration.

Why Is There No Need for Insects to Have a Cardiovascular