Here is a sample of the answers for Chapter 9 of the Egan’s Workbook. For rest of the answers, check out our Workbook Helper. We have both the 10th and 11th Edition available.

1. Stage: Saccular stage
Week: Surfactant starts about 25 weeks, 32 weeks is the safest early point
2. The placenta
3. One vein connects to the fetus by means of two umbilical arteries which transport blood to the placenta.
4. The effects of fetal hemoglobin and the Bohr effect, which also possess high hemoglobin levels.
5. Foramen ovale
6. Pulmonary vasoconstriction due to the low PO2 in the fetal environment
7. Apart from the 10% or less which flows through the lungs, it heads to the descending aorta by means of the ductus arteriosus.


For the rest of the answers, check out the Workbook Helper

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10th & 11th Edition