What type of tissue would most likely be composed of cells that contain many mitochondria? A) muscle tissue
B) connective tissue
C) nervous tissue
D) epithelial tissue

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.