What is meant by the counterflow of fluid through the limbs of the loop of Henle and what is its role in
the normal function of a human kidney? What will be an ideal response?
Concepts to Consider: The filtrate passing down through the descending limb of the loop is flowing
in an opposite direction to the filtrate moving upward through the ascending limb. This countercurrent
mechanism helps maintain a high salt concentration in the interstitial fluid of the medulla that draws
water osmotically from the filtrate in the collecting ducts, thus preventing dehydration and excessive
water loss.
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Epigenetic changes
A) pass from one cell generation to the next but do not alter the DNA sequence. B) do not pass from one cell generation to the next but do alter the DNA sequence. C) irreversibly alter the DNA sequence and are only passed to the next cell generation if they add an advantage. D) alter the RNA codon, which are amino acid assignments of the genetic code.
The first living cells were probably eukaryotic
1.True 2.False
The right hemisphere of the cerebrum deals mainly with
a. visual-spatial relationships b. music c. creative activities d. b and c only e. a, b and c
Thorough cooking of food will prevent all of the following EXCEPT
A) trichinellosis. B) beef tapeworm. C) staphylococcal food poisoning. D) salmonellosis. E) shigellosis.