The labor in women- The Parturition or childbirth (labor) is the process of expulsion of the foetus out from the womb through the vagina. Several hormonal changes occur during this period that prepares the mother for parturition.
In the above case, the cervical dilatation with cervical opening of 10 centimeters is also due to release of oxytocin (from the posterior pituitary) by a reflex mechanism.
The other words such as blood pressure, birth process and exhumation are not going to depict 50% dilation of parturition.
Thus, the options (a), (d) and (c) are incorrect.
In the above case, the cervical dilatation with cervical opening of 10 centimeters is also due to release of oxytocin (from the posterior pituitary) by a reflex mechanism.
Therefore, the correct option is – b. cervical opening