The key to a healthy vegetarian diet is variety. Just as your parents should be concerned if you only eat. hamburgers, they should also worry if you only eat potato. chips and salad. A healthy and varied vegetarian diet includes vegetables, fruits, plenty of leafy greens, whole grain products, nuts, seeds, and legumes. Some vegetarians choose to eat dairy. products and/or eggs, while vegans do not eat these foods. Teenage vegetarians have nutritional requirements that. are the same as other teens.
During prenatal development, the umbilical cord is physiologically and genetically part of the fetus and, (in humans), normally contains two arteries (the umbilical arteries) and one vein (the umbilical vein), buried within Wharton's jelly.
However, this naming convention reflects the fact that the umbilical vein carries blood towards the fetus's heart, while the umbilical arteries carry blood away. The blood flow through the umbilical cord is approximately 35 ml / min at 20 weeks, and 240 ml / min at 40 weeks of gestation. 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.