The most numerous blood cells are ________
A) neutrophils B) monocytes C) lymphocytes D) red blood cells
Answer: D
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The visceral pericardium lines the pericardial cavity, whereas the parietal pericardium covers the surface of the heart.
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.
Robert Hooke was an English scientist who first described ____ by looking at a thin slice of cork under his primitive microscope
a. organelles b. cells c. plastids d. proteins
When is fibrin produced during the coagulation cascade?
A) common pathway B) extrinsic pathway C) intrinsic pathway D) both intrinsic and extrinsic pathways