The Descending Limb of the Nephron Loop ________

question 84

Multiple Choice

The descending limb of the nephron loop ________.

• A) is not permeable to water
• B) is freely permeable to sodium and urea
• C) pulls water by osmosis into the lumen of the tubule
• D) contains fluid that becomes more concentrated as it moves down into the medulla

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Definitions:

Signal Molecules

Chemical substances produced by cells that are used to communicate with or signal other cells, orchestrating a wide range of physiological responses.

Phenotypic Traits

Observable characteristics of an organism, which result from the interaction of its genotype with the environment.

MicroRNAs

Small non-coding RNA molecules that play a role in regulating gene expression by binding to and silencing target mRNAs.

Transcription

Transcription is the process that takes place when RNA polymerase reads a coding sequence of DNA and produces a complementary strand of RNA, called messenger RNA (mRNA).