The placenta is an organ that is present in the body of the women (and female mammals) during pregnancy, then is expelled.
This organ presents numerous functions which relate the baby to its mother and satisfies the needs of respiration, nutrition and excretion of the fetus during its growth and development.
Some of them are:
• Separate maternal fetal circulation.
• Prevents the free passage of molecules.
• Controls placental transfer.
• Permeable to some drugs and microorganisms.
• Mediator of humoral immunity (Immunoglobulin G).
• Controlling the flow and diffusion of molecules, particles, microorganisms and medicines.
• Also controlling the concentrations on both sides of the membrane.
• Managing placental metabolism.
• Controlling the hydrostatic or osmotic pressure on both sides of the membrane.
• During pregnancy, the placenta forms, among other substances, large amounts of hormones (protein hormones and steroid hormones) essential for pregnancy to proceed normally.
Taking charge of two circulatory systems at the same time:
• Maternalplacental circulation.
• Fetoplacental Circulation.
And it also regulates its own blood flow.
• Synthesizes and provides the fetus the metabolic products that are necessary for its evolution and growth.
• The placenta is the first fetal lung, although with less capacity.
• Through the circulation and gaseous exchange of the mother, the placenta is responsible for providing the fetus with oxygenated blood.
Bibliography:
Obstetrics and Maternal-Fetal Medicine Editorial Panamericana.
Images:
Google images '' Labeled for reuse ''. Source: Wikimedia.
