To bypass the pulmonary circulation in the fetal heart, much of the blood entering the right atrium is shunted directly to the left atrium through the

A. foramen ovale.
B. vernix caseosa.
C. fontanel.
D. umbilical cord.


Ans: A. foramen ovale.

Biology & Microbiology

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During the luteal phase, a __________ forms from cells that surrounded the egg. Fill in the blank(s) with the appropriate word(s)

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Which of the following causes DNA to wrap tightly

around histones essentially preventing transcription? a. methylation b. acetyl CoA c. nitrogenation d. dehydration e. carbonation

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The term "paracrine signaling" refers to

a. signaling between cells located far from each other. b. stimulation of a cell by substances produced by the cell itself. c. signaling between cells located close to each other. d. signaling between parenchyma cells.

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Chemical reactions that can proceed toward either anabolism or catabolism are called

A) glycolytic. B) light-independent. C) synthetic. D) cyclic. E) amphibolic.

Biology & Microbiology