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| Description: During development, the baby is totally dependent on the mother for survival. At birth, the fully developed newborn body begins to function independently. At birth, the lungs are able to exchange oxygen and carbon dioxide thanks to surfactant that began to develop by the end of the 6th month. The respiratory rate at birth is 45 breaths per minute, dropping to the normal 12 breaths per minute within 2 weeks. After the baby’s first breath, many changes must be made in the cardiovascular system over time. The foramen ovale closes to become the fossa ovalis. The ductus arteriosus closes to become the ligamentum arteriosum. The umbilical arteries fill with connective tissue. The umbilical vein becomes the ligamentum teres of the liver. Picture Stats: Views: 222 Filesize: 1.32MB Height: 900 Width: 1100 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40540 |