Name the regulatory factor in childbirth

The regulatory factor in the childbirth is the pressure on the cervix of the woman. When a pregnant woman undergoes labor, her cervix changes allowing her body to deliver the baby safely. The cervix changes a lot during the labor and the delivery process. It moves to the anterior position from its previous posterior position. The cervix flex along with the uterine contraction and because of the intrauterine pressure. The cervix become effaced during the process of the labor. The ripening of the cervix starts at the end of the pregnancy. It softens and thins and then, dilates during the delivery.

hence, the answer is 'pressure on the cervix'.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .