"In closing, I emphasize what the Court does not do by these decisions. The Court does not today hold that the Constitution compels abortion on demand. It does not today pronounce that a pregnant woman has an absolute right to an abortion. It does, for the first trimester of pregnancy, cast the abortion decision and the responsibility for it upon the attending physician, whose judgment is to be exercised, as always, upon long established medical standards. For the period following the first trimester, the decisions permit the state, if it chooses, to impose reasonable regulations for the protection of maternal health. And, after viability, they give the state full right to proscribe all abortions except those that may be necessary, in appropriate medical judgment, for the preservation of the life or health of the mother."