Organ Definition. An organ is a self-contained group of tissues that performs a specific function in the body. The heart, liver, and stomach are examples of organs in humans. The word organ comes from the Latin organum, which means “instrument”. ... Organs are found in most animals and plants.
The third basic component of an exercise program that includes cardio and flexibility would be cardiorespiratory endurance. These are the key components to have a good exercise program
