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RSIs are becoming more common in kids and teens because they spend more time than ever using computers. When you run, the messages to the brain are more involved, because many muscles have to work in rhythm. Pivot joints allow a rotating or twisting motion, like that of the head moving from side to side. So they work in pairs of flexors and extensors. AHS-tee-uh-blastz , which make new bone and help repair damage; osteocytes pronounced: Each of the vertebrae in the spine moves in relation to the one above and below it, and together these movements give the spine its flexibility. Repetitive stress injuries RSIs. But three to five people out of 1, have a condition called scoliosis pronounced: These plates consist of columns of multiplying cartilage cells that grow in length, and then change into hard, mineralized bone.

Bone me sex galleries 3


Muscles pull on the joints, allowing us to move. After a bone fracture, new bone cells fill the gap and repair the break. Its rhythmic, powerful contractions force blood out of the heart as it beats. This is where red and white blood cells are formed in the marrow. OSD usually strikes active teens around the beginning of their growth spurts, the approximately 2-year period during which they grow most rapidly. Although the condition usually affects older people, girls with female athlete triad syndrome and teens with eating disorders can get the condition. STRY-ay-ted because they are made up of fibers that have horizontal stripes when viewed under a microscope. Osteoclasts are very active in kids and teens, working on bone as it is remodeled during growth. Our bones begin to develop before birth. They make the skeleton flexible — without them, movement would be impossible. There are three kinds of freely movable joints that play a big part in voluntary movement: From our head to our toes, our bones provide support for our bodies and help form our shape. The soft bone marrow inside many of our bones is where most of the blood cells flowing through our bodies are made. The ribs form a cage that shelters the heart, lungs, liver, and spleen, and the pelvis helps protect the bladder, intestines, and in girls, the reproductive organs. The motor cortex on the right side of the brain controls the muscles on the left side of the body and vice versa. Exercising regularly and getting plenty of calcium when you're a kid and teen can prevent or delay you from getting osteoporosis later in life. Your muscles can pull bones, but they can't push them back to their original position. The amounts of certain vitamins and minerals that you eat, especially vitamin D and calcium, directly affect how much calcium is stored in the bones. Health problems that involve arthritis in kids and teens include juvenile idiopathic arthritis JIA, also know as juvenile rheumatoid arthritis, or JRA , lupus , Lyme disease , and septic arthritis a bacterial infection of a joint. This stress generally is from repeating the same movements over and over again. Smooth, or involuntary, muscle is also made of fibers, but this type of muscle looks smooth, not striated. The movements your muscles make are coordinated and controlled by the brain and nervous system. Sprains are an overstretching or a partial tear of the ligaments. Joints allow our bodies to move in many ways. Ossification is when the cartilage is replaced by hard deposits of calcium phosphate and stretchy collagen, the two main components of bone.

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    AHS-tee-uh-blastz , which make new bone and help repair damage; osteocytes pronounced: This is where red and white blood cells are formed in the marrow.

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