The Supreme Court shall consist of seven judges, one of whom shall be the Chief Justice. A majority of the judges shall be necessary to constitute a quorum. A majority of the members sitting shall have authority to pronounce a decision except in cases involving the constitutionality of an act of the Legislature. No legislative act shall be held unconstitutional except by the concurrence of five judges. The Supreme Court shall have jurisdiction in all cases relating to the revenue, civil cases in which the state is a party, mandamus, quo warranto, habeas corpus, election contests involving state officers other than members of the Legislature, and such appellate jurisdiction as may be provided by law. The Legislature may provide that any judge of the Supreme Court or judge of the appellate court created pursuant to Article V, § 1, of this Constitution who has retired may be called upon for temporary duty by the Supreme Court. Whenever necessary for the prompt submission and determination of causes, the Supreme Court may appoint judges of the district court or the appellate court to act as associate judges of the Supreme Court, sufficient in number, with the judges of the Supreme Court, to constitute two divisions of the court of five judges in each division. Whenever judges of the district court or the appellate court are so acting, the court shall sit in two divisions, and four of the judges thereof shall be necessary to constitute a quorum. Judges of the district court or the appellate court so appointed shall serve during the pleasure of the court and shall have all the powers of judges of the Supreme Court. The Chief Justice shall make assignments of judges to the divisions of the court, preside over the division of which he or she is a member, and designate the presiding judge of the other division. The judges of the Supreme Court, sitting without division, shall hear and determine all cases involving the constitutionality of a statute and all appeals involving capital cases and may review any decision rendered by a division of the court. In such cases, in the event of the disability or disqualification by interest or otherwise of any of the judges of the Supreme Court, the court may appoint judges of the district court or the appellate court to sit temporarily as judges of the Supreme Court, sufficient to constitute a full court of seven judges. Judges of the district court or the appellate court shall receive no additional salary by virtue of their appointment and service as herein provided, but they shall be reimbursed their necessary traveling and hotel expenses.