Question

What is the function of the navel?

Answer 1

In humans and other vertebrates, the abdomen (also known as the belly, tummy, midriff, or stomach) is the part of the body that lies between the thorax (chest) and the pelvis. The abdomen is the front part of the torso's abdominal segment. The abdominal cavity refers to the space occupied by the abdomen.

Complete answer:
The navel (clinically known as the umbilicus, but commonly referred to as the belly button) is a protruding, flat, or hollowed area on the abdomen where the umbilical cord attaches. A navel is present in all placental mammals.
The "umbilical cord remnant" or "umbilical tip," which is the often protruding scar left by the detachment of the umbilical cord, is a part of the adult navel. The belly button, which is located in the center of the navel, is sometimes referred to as this. The dense fibrous umbilical ring forms an "umbilical collar" around the cord remnant. The periumbilical skin surrounds the umbilical collar. The urachus, a thick fibrous cord formed from the umbilical cord and originating from the bladder, is located directly behind the navel.
It simply commemorates the moment when your umbilical cord was connected to the placenta for the first time. Apart from marking the spot where your umbilical cord was connected to your mother's placenta for blood flow, it serves no other purpose in your body.

Note:
Outies are sometimes mistaken for umbilical hernias; however, unlike an umbilical hernia, they are a completely different shape with no health risks. If the protrusion from the navel (specifically the abdominal wall) is 5 centimeters or more, it is considered an umbilical hernia. An umbilical hernia is usually 1/2-inch or larger in diameter. Concave navels are referred to as "innies." While long-term dietary and exercise changes can affect the shape of the human navel, ascites can cause a sudden change in shape.