This detailed answer explains the concepts of organs, organ systems, and cell physiology in the human body.
An organ is a group of tissues that work together to perform specific functions in the body. Three examples of organs in the human body are the heart, lungs, and liver.
Organ system is a group of organs that work together to perform vital body functions. Five organ systems in the human body include the digestive system, respiratory system, circulatory system, nervous system, and muscular system.
Cells use oxygen through processes like cellular respiration, which is an example of physiology, the study of how living organisms function.
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