Sickle-cell disease results in misshapen red blood cells. What impact does this have on their ability to carry gases in the bloodstream?
A. It reduces their ability to carry oxygen, resulting in anemia.
B. It makes no difference in the ability of red blood cells to carry gases in the bloodstream.
C. It increases their ability to carry oxygen, resulting in anemia.
Answer: A
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Which naturalist developed the same ideas about natural selection as Darwin, only 20 years later?
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The gamma motor neuron maintains appropriate tension within the muscle spindle, allowing it to remain sensitive to changes in length and velocity.
a. true b. false