Dr. Tasha is examining one of her patients. She recognizes that the patient's body is not returning fluid to the bloodstream as it should. Dr. Tasha also learns that the patient is getting sick often and is less able to fight infections than a healthy person. Tasha will most likely tell her patient that the problem is with which body system?

Which of the following includes three parts of the cardiovascular system?

Ahmed is studying certain blood vessels in the body. In these vessels, blood travels from the heart to the muscles in the upper arms. Which type of vessels is Ahmed studying?

Which statement best describes two functions of blood?

Sergey runs a mile in gym class. After running, Sergey breathes heavily, pulling air into his lungs. Which statement best describes the path that the oxygen takes from his lungs to cells in his body?