raskautumista

Raskautumista refers to the process of pregnancy in humans and other mammals. It is a complex biological phenomenon that begins with fertilization and culminates in childbirth. Fertilization typically occurs when a sperm cell successfully fuses with an egg cell, forming a zygote. This zygote then undergoes rapid cell division and travels down the fallopian tube to implant in the uterus.

Once implanted, the developing organism is known as an embryo, and later a fetus. The pregnancy period, also known as gestation, is divided into three trimesters. During the first trimester, the basic structures of the body are formed. The second trimester sees significant growth and development of organs and systems. In the third trimester, the fetus continues to grow and mature in preparation for birth.

Throughout pregnancy, the mother's body undergoes numerous physiological changes to support the developing fetus. Hormonal shifts play a crucial role in maintaining the pregnancy and preparing the body for labor and delivery. Prenatal care, including regular medical check-ups, is essential to monitor the health of both the mother and the fetus and to identify and address any potential complications. The duration of pregnancy varies among species, but in humans, it averages around 40 weeks from the last menstrual period.