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Human regional anatomy. Each planarian transports its excretion to the other planarian, giving and receiving sperm. Reproductive system of planarians. The baby's head usually comes first; the umbilical cord comes out with the baby and is cut after the baby is delivered. Because it has muscular walls it can expand and contract.

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In many other animals a single posterior orifice, called the cloacaserves as the only opening for the reproductive, digestive, and urinary tracts if present.

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The Human Body

When a man becomes aroused sexually excitedthe inside of his penis fills with blood. It's common for women and girls to experience some discomfort in the days leading to their periods. PMS is usually at its worst during the 7 days before a girl's period starts and disappears once it begins. The vagina connects a girl's outer sex organs to her internal sex organs. This is perfectly normal and not a problem. It can take up to 2 years from menarche for a girl's body to develop a regular menstrual cycle. Namespaces Article Talk.

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