Identify two changes that occur at or shortly after birth that allow the neonate to live independently. What will be an ideal response?
The neonate begins to breathe within a few seconds of birth as a result of carbon dioxide accumulating
in the blood after the umbilical cord is cut. The lungs expand, and there is increased blood flow from
the right ventricle to the pulmonary vessels. The foramen ovale closes.
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Indicator organisms are added to drinking water to test whether the purification process is being carried out effectively.
Answer the following statement true (T) or false (F)
Radula modification allowed all of the following functions in gastropods except
A. scraping algae off rocks. B. eating vegetation. C. boring holes in other mollusk shells. D. protecting themselves with nematocysts. E. injecting poison through a harpoon-like structure.
The major site of cell membrane synthesis is the
A. plasma membrane. B. endoplasmic reticulum. C. nucleus. D. lysosome.
Why is a drop in blood pressure potentially dangerous?
A. Once pressure drops, it can take hours to increase it again. B. Low blood pressure leads to gas bubbles in the blood that can cause a stroke or the "bends". C. If pressure is not high enough, blood vessels collapse and can become stuck closed. D. Active cells, like those in the brain, need a continuous supply of oxygen and nutrients.