The Uterus.
Artery
to protrect them
because it allows the baby to pass
Arterial walls contain thick, muscular tissue to pump blood throughout the body. Veins have thinner walls.
Vein
In longitudinal section, the walls of the atria are thinner, and lined with pestinate muscles. The walls of the ventricles, meanwhile, are thick and muscular.
The "muscular neck" of the uterus is called the cervix.
The uterus is designed to be muscular because it has to bear a lot of weight.
Arteries have thick muscular walls to push your blood and spread out the pulse so it lowers its pressure. Your blood pressure is quite high when it leaves your heart and it comes in pulses. When it finishes going through your arteries and into your capillaries, your body wants it to go slow and be gentle. The muscles in your arteries change it to a smoother flow as they push it along.
The uterus has thick walls because a fertilized egg would need a thick lining in order to implant and begin to grow and develop. The uterus is sterile and has no bacteria present, however large quantities of debris and bacteria is brought into the uterus with the sperm. Therefore, the walls must be strong and muscular because uterine contraction has to occur to expel fluid, dead sperm and bacteria out from the uterus and through the open cervix.
Endometrium is found on the inside walls of the uterus.