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What else can I help you with?
Does a squid have a placenta and an umbilical cord?
No, only mammals have a placenta with umbilical chord.
What supplies food and oxygen for the developing embryo?
The developing embryo is nourished by the yolk sack until implantation. Upon implantation the placenta begins to develop, the placenta acts as the fetal lung , it transports oxygen to the fetus and carbon dioxide away from the fetus via the umbilical cord. The placenta also provides stored carbs for the developing fetus.
Do fraternal twins share a placenta?
Yes, fraternal twins can share a placenta if they are from the same fertilized egg that split into two embryos.
Why doesn't a human embryon need a large yolk sac?
Yolks are required for embryos in eggs because it's their only source of sustenance for it's development until it hatches. Humans embryos are connected to their mother by an umbilical cord, which the fetuses use to get nutrients directly into their blood streams from the mothers blood.
Do test tube babies have belly buttons?
Yes they do. The eggs are collected from the woman and fertilised in the lab. Once they have fertilised and started to divide to become embryos they are returned to the woman's uterus. They then have the same potential to implant in the uterus lining and grow into a foetus and placenta connected by an umbilical cord just like an embryo created by more 'normal' means.
Where do developing embryos of animals get their food from?
If the animal comes from an egg it will get its nutrients from the yolk. If it is a mammal it will get it from the umbilical cord.
Can fraternal twins share a placenta?
Yes, fraternal twins can share a placenta if they are from the same fertilized egg that split into two embryos. This is known as a monochorionic pregnancy.
What is the structure in mammalian embryos that develops in to the brain and spinal cord?
Neural Tube
In amphibians what develops into a backbone?
In embryos of amphibians the notochord develops into the backbone. The notochord is comprised of cells and defines the primitive axis of the embryo.
What is an allantois?
An allantois is a sac which develops in the alimentary canal of the embryos of mammals, birds and reptiles.
How do embryos receive oxygen and nutrients and how does it get rid of wastes?
Embryos receive oxygen and nutrients through the mother's placenta, which acts as a filter to supply essential substances. Waste products, such as carbon dioxide and urea, are also removed by the placenta and then excreted from the mother's body. This exchange of materials occurs through the blood vessels of the mother and the embryo.
Do monkeys have an amniotic membrane?
No, only mammals which develop inside the mother's womb depend on a placenta for their growth, and therefore have an umbilical cord. (There is no umbilical cord involved in the development of those few mammals who lay eggs or whose babies develop in the mother's pouch.) Since birds are hatched from eggs, no placenta-umbilical cord mechanism is involved. Most of a fetal bird's development takes place outside its mother's body, in the egg.
