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Nervous, muscular, and skeletal system study guide What gives flexibility to your neck? What accumulates in muscles after very strenuous exercise? What makes up the central nervous system? What are the main roles of the skeletal system? What is cartilage? How can you keep your skeletal system healthy? What is smooth muscle? What is skeletal muscle? What is a neuron and what is its function? What are the main functions of the nervous system? What is the spinal cord? What is bone marrow? What is cardiac muscle? What is a reflex? What is the function of a dendrite? What are fixed joints? What kind of joints are vertebrae? Do muscles need oxygen to produce energy for contractions? You will need to be able to label the parts of a neuron; the different lobes of the brain; the 13 muscles pictured above, or you can find the muscle figure on page 530; and all of the bones labeled on the picture above except the cervical, thoracic, and lumbar vertebrae, sacrum, coccyx, and calcaneus. You may want to refer to the skeleton handout we labeled in class on Monday, to study the major bones of the body.