Mammalian Gas Exchange

Which of the following determine an organism's need for an exchange system?

Label the two species according to which has the larger surface area : volume ratio and which has the smaller.

Label the main structures in the human gas exchange system.

Which of the following occur during inhalation? Check all that apply.

The type of epithelium lining alveoli is [blank_start]squamous[blank_end].

The [blank_start]alveoli[blank_end] of the lungs are highly specialised to efficient gas exchange. For example, as well as having a high blood supply, they have a large [blank_start]surface[blank_end] [blank_start]area[blank_end], and there are only [blank_start]two[blank_end] layers of cells between the alveolar sac and the blood, creating a short [blank_start]diffusion[blank_end] [blank_start]distance[blank_end] (about [in digits] [blank_start]1[blank_end] micrometer). The epithelium secretes a [blank_start]surfactant[blank_end] that acts as a solvent for the gases and the linings are permeable to [blank_start]oxygen[blank_end] and [blank_start]carbon[blank_end] dioxide.

Where in the mammalian respiratory tract are ciliated cells found?

What is the main benefit of the C-shape of cartilage found in the trachea?

Which of the following types of soft tissue play major roles in contraction and dilation during ventilation?

Label the histology cross-section from a bronchus.

When the smooth muscle around the trachea contracts, the lumen of the trachea expands.