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What is 1 + 3?
heart and blood vessels
nose, pharynx, trachea, bronchi, lungs
mouth, pharynx, esophagus, stomach, intestines, pancreas, liver
kidneys, ureters, urinary bladder, urethra
skin, hair, nails, sweat and oil glands
lymphatic vessels, lymph nodes, spleen
brain, spinal cord, nerves
hormone producing glands
testes, epididymis, ductus deferens, penis, ovaries, uterine tubes, uterus, vagina