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activity amino acids antibodies antigens appropriate term listed atoms bacteria blood vessels body body's bone brain calcium called cancer capillaries Carbohydrates carbon dioxide cartilage cause cavity cellular respiration cerebral cortex chemical choices provided chromatids chromosomes composed connective tissue contains contraction correct the underlined cortex cycle cytoplasm definition or description digestive disease division embryonic energy enzymes eukaryotic fatty acids fibers fluid function gametes genes genetic glands glucose hormones human hydrogen hypothalamus immune system increase infection ions kidney layer lobe lungs major mastered this chapter Match each definition medulla meiosis membrane mitosis molecules muscle nerve nervous system neurons neurotransmitter nucleotide nucleus numbers refer nutrients OBJECTIVES After studying occurs organs ovum oxygen percent pituitary plasma produce proteins reactions receptors release reproduction Scientific American secrete sensory sexual skin species sperm spinal cord stimulates structure substances sugar transport true tube tubule types underlined word(s viruses vitamin