The ________ valve of the heart has three valves with chordae tendineae.
Fill in the blank(s) with the appropriate word(s).
tricuspid
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In reptiles and birds, the evolution of the _____________ removed the dependence on water and allowed complete transition to life on land
Fill in the blank with the correct word.
Most people retain adequate kidney function in old age. Why?
A. Nephrons use blood more efficiently. B. Glomeruli grow new blood vessels through life. C. A loss of nephrons does not radically impair function because there are so many to begin with. D. Decreased activity in old age leads to a decrease in production of toxins. E. Older people drink less fluid and therefore have less need to produce urine.
The single-celled protists are often elongated rather than spherical in order to
a. decrease ?X from environment to mitochondria. b. increase "D.". c. increase ?P. d. increase "A.".
A cation is
A. a combination of atoms held together by chemical bonds. B. an alteration in the three-dimensional structure of a protein. C. a negatively charged ion. D. a molecule that conducts electricity when placed in solution. E. a positively charged ion.