Final answer:
Ventilation, or breathing, is the process of inhaling and exhaling air, which improves the effectiveness of the lungs in humans.
Step-by-step explanation:
The effectiveness of the lungs in humans is improved by them being ventilated. Ventilation, or breathing, is the process of inhaling and exhaling air. It helps to bring oxygen into the lungs and remove carbon dioxide. During inhalation, the contraction of the diaphragm and other muscles expands the lungs, allowing air to enter. During exhalation, the relaxation of the diaphragm and elastic recoil of the lungs expel air.