Which of the following statements is false? Unselected We clear and swallow over 2 million alveolar macrophages per hour. Unselected Alveolar surfaces are usually sterile. Unselected Remarkably efficient alveolar macrophages crawl freely along the internal and external alveolar surfaces. Unselected Huge numbers of infectious microorganisms are continuously carried into the alveoli.

Remarkably efficient alveolar macrophages crawl freely along the internal and external alveolar surfaces

Explanation:

The alveolar macrophages are present on the internal lumenal surfaces of the alveolar ducts,  the alveoli, and the bronchioles.

Alveolar macrophages are phagocytes that uses several surface receptors to release many secretions, to interact with other cells and molecules.

But the alveolar macrophages are intact to the inner surface only and do not crawl freely along the internal and external alveolar surfaces.

Hence, the correct option is " C".

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.