Cardiac muscle cells undergo continuous aerobic respiration, are called the most energetic cells in the body, and therefore contain numerous because cardiac muscle cells also contain various protein fibers there must be an abundance of present as well

Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.