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- A developing fetus gets oxygen from its mothers blood. Fetal capillaries run through pools of maternal blood in an organ called the placenta. As fetal blood runs through these capillaries, it exchanges substances with the maternal blood around the capillary. The hemoglobin made by a fetus is different than that made after birth. Fetal hemoglobin binds oxygen more strongly at low oxygen levels than normal hemoglobin. How would fetal hemoglobins somewhat higher affinity for oxygen benefit the fetus?Fetal hemoglobin binds 2,3 BPG with greater affinity than adult hemoglobin.TrueFalseWhy is fetal hemoglobin’s affinity for O2 greater than thatof maternal hemoglobin?
- How does the oxygen-binding curve of fetal hemoglobin differ from that of adult hemoglobin?Oxygen affinity of fetal blood is higher than that of maternal blood and may help to provide the fetus with an adequate oxygen supply during pregnancy. In mammals, 2, 3-biphosphosphoglycerate (BPG) mediates intracellular hemoglobin function by lowering cxygen affinity. Fetal red blood cells have higher affinity for oxygen because of a smaller effect of BPG on oxygen affinity of fetal hemoglobin (Hb F) compared with adult Hb (Hb A). Which symbol shows the PS0 value corresponding to Hb F? 14 12 10 0.0 0.5 1.0 1.5 2.0 2,3-BPG (mM) O Crcle O Dimond O Square O Triangle (6H ww) dFigure 5 shows oxyhemoglobin dissociatlon curves at pH 7.2 and pH 7.4. Which of the following is true at PO2 less than 40 mm Hg? 27. % saturation af haemogiobin 100 pH 7.4 80 60 pH 7.2 40 + 20 10 20 30 40 50 60 70 Po; (mm Hg) Figure 5 A. Hemoglobin retains less O2 at pH 7.4 compared to pH 7.2. B. Hemoglobin retains less O2 at pH 7.2 compared to pH 7.4. C. The release of O2 from hemoglobin is not influenced by the production of CO2. D. At pH 7.2 where CO2 production is less than pH 7.4, hemoglobin releases less O2.
- od For on a 3 Fetal hemoglobin binds oxygen more tightly than does adult hemoglobin. Why do you think fetal hemoglobin functions differently than adult hemoglobin Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Submit Fatal Adull oxygen hemoglobin primary secondary tellary carbon dioxide hemoglobin must extract Previous Answers Request Answer from the maternal oxygenated across the placenta developing fetus better access to hemoglobin behaves differently than adult hemoglobin suggests that the two protein molecules have different structures hemoglobin binds Reset Help more tightly in order to give the from the mother's bloodstream. The fact that fetalTrue or false Chemically-linked hemoglobin moelcules can stay in the blood for as long as 72 hrs. Cow hemoglobin can be safelty used by humans. Free hemoglobin produces vasoconstruction of blood vesselsand increases blood pressure in patients.The fraction saturation curve for fetal hemoglobin and oxygen shows a left shift compared to Maternal hemoglobin curves because: (select all true statements) O Fetal hemoglobin has a poor binding affinity for DPG (aka BPG), which stabilizes maternal hemoglobin O Fetal hemoglobin to has a higher affinity for 02 O Fetal hemoglobin has a lower affinity for 02 Fetal hemoglobin only has one subunit. O The resulting graph allows you to calculate nH
- What is the difference in the quaternary structure between fetal hemoglobin and adult hemoglobin? Which one can carry more oxygen?In which of the following erythropoetic cells does hemoglobin synthesis begin? Oa Polychromatophilic erythroblast Ob Proerythroblast oh 3cOrthochromatic erythroblast Od Reticulocyte e. Basophilic erythroblastDescribe the influence of temperature, pH and pCO2 on O2-hemoglobin affinity/binding.