Movement is the tissue three layers: outer, middle class in changing the structure of the body tissue three floors below Ectoderm outer - skin, hair, his nails scale ungulate animals - nervous system (brain, spinal cord) - pituitary section. front and center - enamel salivary gland - the adrenal glands in. Pituitary end Mesodarm middle class - skeletal system. Musculoskeletal system - circulatory system (heart, spleen, blood vessels) - excretory system (kidneys) - reproductive system (ovaries and testicles) in endoderm - Gastroenterology. (Esophagus, stomach, intestines, liver, pancreas) - respiratory system (trachea, lung) - tonsils, middle ear thyroid - the gland parathyroid Al Landon T. Boyd yolk sac - bladder, urethra - (primordial. germ cell)
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