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Human embryonic development covers the first eight weeks of development, which have 23 stages, called Carnegie stages. At the beginning of the ninth week, the embryo is termed a fetus (spelled "foetus" in British English). In comparison to the embryo, the fetus has more recognizable external features and a more complete set of developing organs.
Fetal hemoglobin, or foetal haemoglobin (also hemoglobin F, HbF, or α 2 γ 2) is the main oxygen carrier protein in the human fetus. Hemoglobin F is found in fetal red blood cells , and is involved in transporting oxygen from the mother's bloodstream to organs and tissues in the fetus.
Adapted to the weight of the fetus, this corresponds to 115 mL/min/kg at 20 weeks and 64 mL/min/kg at 40 weeks. [18] It corresponds to 17% of the combined cardiac output of the fetus at 10 weeks, and 33% at 20 weeks of gestation. [18] Endothelin and prostanoids cause vasoconstriction in placental arteries, while nitric oxide causes vasodilation ...
At 5 weeks, the embryo is a mass of cells with a developing neural tube (pre-spinal cord and brain). The forming fetus is no larger than a grain of rice.” Pregnancy tissue after an abortion at 5 ...
The third trimester is defined as starting, between the beginning of week 28 (27 weeks + 0 days of GA) [37] or beginning of week 29 (28 weeks + 0 days of GA). [4] It lasts until childbirth . Timeline of pregnancy, including (from top to bottom): Trimesters, embryo/fetus development, gestational age in weeks and months, viability and maturity stages
A human fetus, attached to placenta, at three months gestational age. In humans, the fetal stage starts nine weeks after fertilization. [7] At this time the fetus is typically about 30 millimetres (1 + 1 ⁄ 4 in) in length from crown to rump, and weighs about 8 grams. [7] The head makes up nearly half of the size of the fetus. [8]
A woman's breasts change during pregnancy to prepare them for breastfeeding a baby. Normal changes include: Tenderness of the nipple or breast; An increase in breast size over the course of the pregnancy; Changes in the color or size of the nipples and areola; More pronounced appearance of Montgomery's tubercles (bumps on the areola)
Different terms are used to describe prenatal development, meaning development before birth. A term with the same meaning is the "antepartum" (from Latin ante "before" and parere "to give birth") Sometimes "antepartum" is however used to denote the period between the 24th/26th week of gestational age until birth, for example in antepartum ...
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