The pyramids are located in the:
a. pons
b. medulla
c. spinal cord
d. cerebellum
Answer: b. medulla
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The actual sites of gas exchange within the lungs are the
A) bronchioles. B) terminal bronchioles. C) spaces between the parietal and visceral pleura. D) blood air barrier of the alveoli. E) interlobular septa.
The ________ is a significant site of absorption of water and electrolytes, but NOT of nutrients.
A) stomach B) large intestine C) small intestine D) mouth E) None of the answers are correct.
Dehydration synthesis can happen easily at room temperature.
Answer the following statement true (T) or false (F)
The concentration of oxygen in the atmosphere is currently 21 percent, but it has been both higher and lower during the Phanerozoic
At the start of the Permian it reached a maximum of 30 percent to 32 percent and then declined throughout the Permian and Triassic, reaching its minimum of 13 percent to 15 percent at the end of the Triassic. Dinosaurs and mammals both appeared in the Triassic, but dinosaurs flourished and radiated into a variety of large-bodied lineages, whereas mammals remained small and did not radiate into multiple lineages. Recall the characteristics of the respiratory systems of sauropsids and synapsids described in Chapter 11 to explain how the low concentration of atmospheric oxygen in the Permian may have favored the development of dinosaurs over mammals.