Question

Spongy tissues composed of microscopic cells in which inhaled air is exchanged for carbon dioxide during one breathing cycle

Answer 1

The answer is lungs. The lungs feel spongy due to the numerous (millions) of alveoli structures that compose it. It is in the alveoli that gaseous exchange between the lungs and the blood capillaries occurs. Alveoli are thin sac-like structures with numerous blood capillaries that provide large surface areas for gaseous exchange to occur efficiently

Answer 2

Spongy tissues composed of microscopic cells in which inhaled air exchanged for carbon dioxide during one breathing cycle are lungs.
Gaseous exchange is the delivery of oxygen from the lungs to the blood stream, and the elimination of carbon dioxide from the bloodstream to the lungs. It takes place in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.