Final answer:
Type II alveolar cells are cuboidal in shape and possess lamellar bodies that store surfactants, vital for reducing alveolar surface tension and preventing collapse.
Step-by-step explanation:
Type II alveolar cells are of a cuboidal shape and contain lamellar bodies that store surfactants for reducing surface tension. Therefore, the correct answer is d) Spherical, lamellar bodies. Type II alveolar cells are interspersed among the type I alveolar cells within the alveolar wall and have the crucial function of secreting pulmonary surfactant. This substance, which is composed of phospholipids and proteins, is vital for reducing the surface tension within the alveoli, thus preventing alveolar collapse during expiration. These cells play an essential role in maintaining the lung's functionality and ensuring efficient gas exchange.