Final answer:
The respiratory system is in charge of obtaining oxygen and removing carbon dioxide, while the digestive system is responsible for breaking down food and absorbing nutrients. The circulatory system transports oxygen, nutrients, and waste products throughout the body.
Step-by-step explanation:
The respiratory system is responsible for obtaining oxygen and getting rid of carbon dioxide, and aiding in speech production and in sensing odors. From a functional perspective, the respiratory system consists of organs and structures such as the nasal cavity, trachea, bronchi, lungs, and alveoli. It facilitates the exchange of gases between the body and the outside air, and works in conjunction with the circulatory system to deliver oxygen to body cells and remove carbon dioxide.
The digestive system, on the other hand, is in charge of breaking down food into smaller molecules that can be absorbed by the body. It includes organs such as the mouth, esophagus, stomach, small intestine, and large intestine. These organs carry out processes such as ingestion, digestion, absorption, and elimination to ensure that nutrients are obtained and waste is removed.
The circulatory system is responsible for the transportation of oxygen, nutrients, hormones, and waste products throughout the body. It consists of the heart, blood vessels, and blood. The circulatory system ensures that oxygen is delivered to body cells, collects carbon dioxide and other waste products, and transports them to the appropriate organs or systems for elimination.