Which physical change commonly occurs in a pregnant woman's body due to hormonal influences?

During pregnancy, a woman's body undergoes many physiological changes driven by hormonal influences, one of the most significant being an increase in blood volume. This increase is primarily stimulated by the hormones progesterone and estrogen, which help to support the developing fetus by providing adequate nutrients and oxygen through enhanced blood circulation.

The rise in blood volume typically starts in the first trimester and can increase by approximately 40-50% by the end of the pregnancy. This expansion is essential for accommodating the increased metabolic demands of both the mother and the growing fetus, as well as to ensure that there is sufficient blood flow to the placenta.

Moreover, the increased blood volume helps in maintaining blood pressure during pregnancy, as the body also produces additional blood vessels to cater to the growing vascular needs. This adaptation is crucial for the health of both mother and child, allowing for effective nutrient transfer and supporting the overall physiological demands of pregnancy.