Starfish, also known as sea stars are echinoderms that belong to the class Asteroidea. They are marine invertebrates that are found in seabeds in oceans all over the world. This article gives a diagrammatic representation of the starfish along with its i
Renal system, in humans, organ system that includes the kidneys, where urine is produced, and the ureters, bladder, and urethra for the passage, storage, and voiding of urine. Learn more about the structure and function of the renal system in this articl
Human muscle system, the muscles of the human body that work the skeletal system, that are under voluntary control, and that are concerned with movement, posture, and balance. Broadly considered, human muscle—like the muscles of all vertebrates—is ofte