Fetal circulation ||Circulatory system in Hindi ||Fetoplacental circulation|| Nursing, NEET
Fetal circulation ||Circulatory system in Hindi ||Fetoplacental circulation|| Nursing, NEET Aspirants , medical, nursing students
In humans, the circulatory system is different before and after birth. The fetal circulation is composed of the placenta, umbilical blood vessels encapsulated by the umbilical cord, heart and systemic blood vessels. A major difference between the fetal circulation and postnatal circulation is that the lungs are not used during the fetal stage resulting in the presence of shunts to move oxygenated blood and nutrients from the placenta to the fetal tissue. At birth, the start of breathing and the severance of the umbilical cord prompt various changes that quickly transforms fetal circulation into postnatal circulation.
Placenta
The placenta functions as the exchange site of nutrients and wastes between the maternal and fetal circulation.[3] Water, glucose, amino acids, vitamins, and inorganic salts freely diffuse across the placenta along with oxygen. Two umbilical arteries carry deoxygenated blood and waste from the fetus to the placenta where waste is exchanged for oxygen and nutrients. The oxygenated blood will then return to the fetus from the placenta via the umbilical vein.
Oxygenation transport in fetus
Hemoglobin is a structure found within the red blood cells that binds to and carries oxygen. Fetal hemoglobin enhances the fetus' ability to draw oxygen from the placenta. This is facilitated by the hemoglobin molecule that made up of two alpha and two gamma chains . Its oxygen-hemoglobin dissociation curve is shifted to the left, meaning that it is able to absorb oxygen at lower concentrations than adult hemoglobin. This enables fetal hemoglobin to absorb oxygen from adult hemoglobin in the placenta, where the oxygen pressure is lower than at the lungs. Around 6 months of age after birth, the gamma chains will gradually be replaced by beta chains. This new hemoglobin structure is known as hemoglobin A, composed of two alpha and two beta chains .Hemoglobin A is the predominant form found in adults.
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सर आपने बताया आर्टरी दो होती है लेकिन डायग्राम में तो एक ही दिखाई दे रही है और वेन दो है जबकि आप एक बता रहे हैं। ये कंफ्यूजन क्यों ??? Ans fast
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