Doctors did notFORM belly button (or navel). The navel is not the scar or knot left by a doctor that cut your umbilical cord at birth. This fact is obvious to anyone that has ever had children or bathed newborns, but it is sometimes misunderstood by others. While you were in your mother's womb, your umbilical cord attached to your navel at one end and to your placenta at the other end. The placenta is a pancake-shaped mass of blood vessels that attaches to the wall of the mother's uterus. Food that your mother ate and oxygen that she breathed went into her blood, and then was carried to her uterus. Where your placenta and your mother's uterus touched, the food and oxygen was exchanged from your mother's blood to your blood. Your blood than carried the nutrients from the placenta, down the umbilical cord, through your navel, and into your body.

Once you were born, you no longer needed to get food and oxygen through your navel, as you could now get them through your mouth. As a result, the umbilical cord was no longer needed and your body had a natural way of getting rid of the cord. On its own, your body closed up the point where the umbilical cord joined your body and formed your belly button. When the doctor or midwife that assisted during your birth cut your umbilical cord, he or she cut it several millimeters away from the end of the cord, leaving a piece of the cord still hanging off your belly. He or she did this to let the body form a well-shaped belly button on its own

QUESTIONS

1.demonstrate the role of the thymus in the maturity of the T cells

2.why is the Bone marrow the primary lymphoid organ?

3.how would youterm the CD8 as a protein thatrecognizes MHC class I proteins?

4.The gene bcl-2 prevents apoptosis in normal cells;justify accordingly

5.how are cell numbers regulated by the Apoptosis

6.show the order of events that lead to the appropriate receptor for the virus?

7. Which infection causes a reduction in the total yield of virus particles?explain

8.as far as the change in the properties of the cell is concerned,which infections cause it?

9.hiow is the latentinfection no infectious progeny produced?

10.UL37x1 is a protein encoded by?explain

Answer rating: 100% (QA)

The detailed answer for the above question is provided below 1 The thymus plays a crucial role in the maturity of T cells It serves as the primary site for T cell maturation where immature T cells fro... View the full answer