Question Detail
Question
What is the function of the yolk sac in early human development?
Correct Answer
Option A is the correct answer.
Detailed Explanation
In humans, the yolk sac is small and does not provide significant nourishment. Its primary roles are to produce the first blood cells and germ cells, and its blood vessels are early conduits.
Hint
In placental mammals, its nutritive role is largely replaced by the placenta.