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Program No. 16 JOINT T hings to Remember : 1, The skeleton is the framework of the body. 2, Muscles pull and let go to move parts of the body. 3, Joints are where bones meet. Bones and muscles work together to hold the body up. The bones form the skeleton, or framework, of the body. Each is shaped to do its own work, as the skull, ribs, and leg bones. The muscles act with the bones. They pull and let go, moving different parts of the body. For example, one set of muscles pulls the leg bones forwardanother set pulls them back. Bone meets bone at the joints. Some joints do not move, such as the joints of the skull. Other parts, like arms, legs, and backbones, have movable joints, either hinge or ball-and-socket type. Ligaments and tendons tie the bones together and tie the ends of muscles to the bones. Things to Do ; 1. Look at bone and muscle cells under a microscope. 2. Study a model or pictures of a skeleton — note different kinds of joints. 3. Examine tendons in wrist and heel. What do they do? Sources : .1, Rogers et al. - Man and the Biological World 2., Carroll - Understanding our World Program No. 17 VOICE Things to Remember : 1. Sound is one form of communication, 2. Our voices are sounds. 3. We use our voices to communicate with others. Sound is a very common means of communication, and probably the most important sound-producing mechanism is that connected with the human voice. Without speech our lives would be very different. We produce sounds when air from the lungs is blown through a narrow slit between two bands of tissue in the throat. These bands, the vocal cords, are set in vibration. This vibration caused the air -13-