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.
Umbilical arteries carry oxygen-poor blood from the fetus and the umbilical vein carries the most oxygen-rich blood to the fetus. Arteries are often described as vessels that carry oxygen-rich blood, and veins are said to carry oxygen âpoor (carbon dioxide-rich) blood. Name two sets of exceptions to this rule that were discussed in this chapter. Pulmonary arteries carry oxygen-poor blood and pulmonary veins carry oxygen-rich blood. Umbilical arteries carry oxygen-poor blood from the fetus and the umbilical vein carries the most oxygen-rich blood to the fetus. Arteries lack valves, but veins have them.