Blood volume represents about ________ percent of a person's body weight
A) 7
B) 15
C) 2
D) 25
E) 42
A
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The centers for cardiac, digestive, and vasomotor functions are housed within the
A. cerebral cortex. B. hypothalamus. C. brainstem. D. spinal cord. E. cerebellum.
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.
A 16-year-old boy with a ruptured spleen comes to the emergency department for splenectomy. Soon after ligation of the splenic artery just distal to its origin, a surgi- cal resident observes that the patient is heal- ing normally. Normal blood flow would occur in which of the following arteries?
(A) Short gastric arteries (B) Dorsal pancreatic artery (C) Inferior pancreaticoduodenal artery (D) Left gastroepiploic artery (E) Artery in the lienorenal ligament
Which type of respiration rapidly produces ATP for short time periods?
A. Anaerobic respiration B. Aerobic respiration C. Both anaerobic respiration and aerobic respiration are correct.