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3.1/3.2 Cartilage is the flexible part of a skeleton babies only have cartilage instead of bones it has no bloodcells or nerves in it Bone harder/strong but still flexible How? Because the calcium and collagen Collagen makes it flexible and calcium makes it hard/strong Bone is made out of -Marrow makes red blood cells -Spongy bone reduces weight - Periosteum makes de bone lager in the width and makes new cells to renew the bone -Head top of bone -Neck bottom of the bone OsteoBLASTS renew broken/damaged bone OsteoCLATST break down the damaged bone 3.3 The place where bones meet is called joint, most joints enable bones to move. The joints in your head are called sutured Cartilaginous joints are found between the ribs and breastbone, hipbones and vertebrae -Hing joints can move like a door so only 1 directions -Ball and socket joints can almost move every direction Pivot joints can turn to right en left The joints and bones are held together by a strong connective tissue called ligaments Voluntary Involuntary Voluntary: Are muscles that are attached to bones with the “tendon” you’re able to move your muscles Involuntary: Muscles like organs that you can’t control… Cardiac: Muscle specialist for the heart and only for the heart Slow twitch = slow but for a long time Fast twitch = Fast for a short time