Of the following choices, the epithelium with the shortest diffusion distance is
A) simple squamous epithelium.
B) simple cuboidal epithelium.
C) simple columnar epithelium.
D) pseudostratified ciliated columnar epithelium.
E) stratified squamous epithelium.
Answer: A
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Animal Behavior
- Most of the exchange surfaces of multicellular animals are lined with
- The absorptive epithelia in the gut are considered "polarized" because
- An exchange surface in direct contact with the external environment is found in the
- Tissues are composed of cells, and tissues functioning together make up
- Multicellular organisms must keep their cells awash in an "internal pond" because
- Interstitial fluid is
- The specialized function shared by the cells that line the lungs and those that line the lumen of the gut is that both types of cells
- To increase the effectiveness of exchange surfaces lining the lungs and the intestines, evolutionary pressures have
- As body size increases in animals,
- All animals, whether large or small, have
- The specialized structures of complex animals have evolved because
- The similar fusiform body shape of diverse animals, such as sharks, penguins, and aquatic mammals, has evolved because
- Evolutionary adaptations that help diverse animals directly exchange matter between cells and the environment include
- Penguins, seals, and tuna have body forms that permit rapid swimming, because
- Which choice best describes a reasonable mechanism for animal structures becoming better suited over evolutionary time to specific functions?
- If thermoregulation is considered to be a secondary function of the large ears of jackrabbits, then the primary function of the ears is
- When the temperature of the outside air exceeds their internal body temperature, jackrabbits living in hot, arid lands will
- Which of the following characteristics indicates that mollusks are more closely related to arthropods than to chordates?
- Many parasitic flatworms have an intermediate host. This indicates that the
- Members of which of the following animal groups were among the first to inhabit land and were ancestors of the reptiles?
- In animals, all of the following are associated with embryonic development EXCEPT
- All of the following are deuterostomes EXCEPT
- In a mammalian embryo, the somites give rise to
- If an invertebrate possesses nephridia as an excretory system, skin as a gas exchange system, and a closed circulatory system, the animal is most likely to be