Inner organs and the skeleton; the brain and nervous system

The human body is made of organs. We can see outer organs such as eyes, ears, nose and tongue. The brain, heart, lungs, stomach and liver are inner organs, protected inside the body under the skull and ribs. The skeleton is our inner support; an adult has 206 bones, children have more (some later fuse together). Bones join in three ways: immovable (parts of the skull), semi-movable (vertebrae) and movable, through a joint (elbow, knee, shoulder). The heart pumps blood into the vessels; the brain controls the whole body; the lungs supply oxygen and remove carbon dioxide; the stomach partly digests food; the liver cleans harmful substances from the blood. Doctors examine inner organs with ultrasound (UTT), which uses sound waves and does not harm the body. If a bone may be broken, an X-ray is taken; it should be done only when a doctor orders it.