The primary effect of increasedPCO2 in the lungs is to cause ________ which ________ the ventilation-perfusion ratio back to a normal level.
A) bronchodilation : increases
B) vasoconstriction : decreases
C) vasoconstriction : increases
D) bronchoconstriction : decreases
E) vasodilation : decreases
Ans: A) bronchodilation : increases
You might also like to view...
Which of the following processes is central to the initiation of transcription?
A) binding of sigma to the promoter region B) formation of a phosphodiester bond in the elongating RNA strand C) binding of DNA polymerase to the promoter region D) formation of a DNA primer
Suppose that a hemophilic male (X-linked recessive
allele) and a female carrier for the hemophilic trait have a nonhemophilic daughter with Turner syndrome. Nondisjunction could have occurred in a. both parents. b. neither parent. c. the father only. d. the mother only. e. none of these.
By what method is T-DNA integrated into the plant genome?
What will be an ideal response?
Which of the following numbered events represents the correct sequence of events of prokaryotic
translation initiation? 1) large ribosomal subunit binds to initiation complex 2) initiation tRNA binds small ribosomal subunit 3) initiation complex binds to ribosome recognition sequence on mRNA a. 1 ? 2 ? 3 b. 1 ? 3 ? 2 c. 2 ? 1 ? 3 d. 2 ? 3 ? 1 e. 3 ? 2 ? 1