The ____________________ system controls and coordinates bodily activities that require swift responses, especially to changes in the external environment
Fill in the blank(s) with correct word
nervous
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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.
Which of the following situations would decrease the oxygenation of fetal blood?
A. A decrease in maternal hemoglobin B. An increase in fetal hemoglobin C. A decrease in binding affinity of maternal hemoglobin D. A decrease in fetal hemoglobin
The ________ is the primary inspiratory muscle in the body
A) serratus anterior B) rectus abdominis C) diaphragm D) internal oblique
Which of the following is most likely to occur when a soldier stands at attention--very still, with legs and spine straight?
A. decreased pressure in the capillaries of the feet B. increased absorption of interstitial fluid by the capillaries of the feet C. increased storage of blood in the veins of the feet and legs D. increased venous return E. increased blood flow to the brain