Final answer:
Oxygen is delivered to body cells by a coordinated effort between the respiratory system, which collects oxygen and expels carbon dioxide, and the circulatory system, which transports oxygen to and carbon dioxide from cells. The pharynx is an organ shared by the respiratory and digestive systems.
Step-by-step explanation:
The organ systems that help deliver oxygen to body cells are the respiratory and circulatory systems. The respiratory system is responsible for the exchange of gases, taking in oxygen and expelling carbon dioxide. This oxygen is then absorbed by the blood in the lungs. The circulatory system, consisting of the heart, blood vessels, and blood, transports this oxygen-rich blood throughout the body to cells that require oxygen for aerobic cellular respiration. Simultaneously, it picks up carbon dioxide, a waste product of cellular respiration, from the cells and carries it back to the lungs for exhalation.
The correct sequence of structures encountered by air entering the body is: nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, and finally, alveoli. The organ that is part of both the digestive and respiratory systems is the pharynx, which functions as a pathway for the movement of food to the esophagus and air to the larynx.