The embryo develops brainwaves and a beating heart during the first trimester of pregnancy. Specifically, the heart typically starts beating around six weeks gestation, while brain activity can be detected around the same time, although more defined brainwaves emerge later in the trimester. These developments are crucial milestones in embryonic growth and signify the beginning of significant physiological functions.
second trimester
The heart begins to beat at the end of 3 weeks. Our 'reptilian brain' develops within the first two months, but our conscious thought does not develop until six months into the pregnancy.
first
trimester
After a sperm fertilizes an egg its referred to as a zygote. Then it becomes a fetus, I believe after the first trimester.
In the first three weeks, the embryo has formed the forebrain, the midbrain and the hindbrain. In your second trimester, the major structures of the brain are in place and functioning. From this point the brain and organs continue to develop.
always
Pregnancy is broken down into three trimesters. The baby develops most rapidly during the first trimester (weeks 1-13). The baby starts off as a collection of cells that develop into an embryo. At 8 weeks, the embryo is called a fetus because the baby resembles a human. At this time, all major organs and systems have been formed. During the second trimester (weeks 14-26), the organs and systems start to mature. During the third trimester (week 27-40), the baby starts to pack on the pounds.
none what so ever :D
The same way that a human embryo or any other mammalian embryo does.
The embryo develops in the uterus of the mother.
If there was an actual embryo, it was not a false pregnancy.