中国大学MOOC: 鞭毛flagella和纤毛cilia主要是属于藻类和真菌的细胞结构。

（ ） are any of the small air spaces in the lungs where leaves the and oxygen enters it. A: Cilia B: Bronchioles C: Tracheae D: Pulmonary alveoli

Characteristics of olfactory epithelium include which one of the following A: It is located in the inferior region of the nasal cavity. B: It is classified as simple columnar. C: It has an underlying lamina propria containing mucous glands. D: It has modified cilia, which act as receptors for odor. E: None