THE HUMAN BODY Vocabulary Unit II achilles tendon, involuntary muscle joint ligament marrow muscle nerves reflex voluntary musclex-ray

x-rays waves that can be used to take an image of and observe the condition of bone and, in some instances, tissue

reflex involuntary movements as a result of unexpected stimulus grasp reflex

involuntary muscle a muscle that you cannot consciously move

ligament tissue that connects a bone to other bones or to cartilage and helps to support joints

achilles tendon a tendon at the back of the ankle that connects the calf muscles and the heel; named after the mythical Greek hero Achilles

muscle tissue that works with the skeleton to make movement possible

joint the point where two bones meet

marrow a tissue that fills many bones and makes most blood cells, including disease-fighting white blood cells

nerves the specialized cells or bundled fibers that send signals from one body part to another Yellow part are nerves

voluntary muscle a muscle that you can consciously move