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acid agglutinin agglutinogen Amniotic sac antibodies artery baby bacteria bile blood pressure blood type blood vessels bloodstream body's bone marrow brain called canal cancer capillaries carbon monoxide cause cell's cerebral cortex chemical chromosomes cochlea cold contains develop digestive disease duct duodenum enters enzymes esophagus fertilized fetus fibers fluid glucose hair heart helper T cells hormone human body immune system insulin juices kidneys layer liver lungs lymph nodes lymphocytes melanin membrane microvilli molecule move mucous mucus muscle contractions myofibrils nerve impulses neurons non-REM sleep nucleus nutrients olfactory organs Osteoblast oxygen pancreas papilla pathogens placenta plasma Platelets produce protein receptors red blood cells red cells release REM sleep retina saliva secrete sensory skin small intestine sperm spinal cord stomach structure surface sweat taste buds teeth tion tissue trachea tube tumor uterus vein virus viruses vocal cords white blood cells