I thought they had some sort of gils very early in development, but they soon disappeared (like their tail), and that oxygen was passed from mother to baby through the blood passing through the umbillical cord.Imparcticle said:Don't unborn babies have pharangeal gills? That's how they breathe, I believe.
I've never heard a credible account on these gills, apparently they appear very early in development and quickly disappear. Oxygen is transferred from the mother's blood to the child's blood in the placenta through a barrier so that there is no blood contact.Imparcticle said:Don't unborn babies have pharangeal gills? That's how they breathe, I believe.
Monique said:I've never heard a credible account on these gills, apparently they appear very early in development and quickly disappear. Oxygen is transferred from the mother's blood to the child's blood in the placenta through a barrier so that there is no blood contact.
Upon water entering the airways, conscious or unconscious victims show laryngospasm, i.e. the Larynx or the vocal cords in the throat constrict and seal the air tube. This prevents water from entering the lungs. Due to this laryngospasm, water enters the stomach in the initial phase of drowning and only very little water enters the lungs.
Monique said:So if a mother has HIV, the child won't catch it.
Imparcticle said:7.)Are placenta only found in humans? Why or why not?
You're right:iansmith said:Are you sure about that? HIV particle is small enough to pass through the cell barrier of the umbilical cord.
85-95% of infants contract Hepatitis B while being born, and the remainder through transplacental transfer or while breastfeeding.About 25 to 33 percent of all pregnant women who don't take the drug zidovudine (AZT) during pregnancy will pass HIV to their babies. Taking AZT while pregnant and having a cesarean, or C-section, delivery drops a woman's chances of passing HIV to her baby to 1 percent.
Babies move in the womb for a variety of reasons. One of the main reasons is to help with their muscle and bone development. By moving and stretching, the baby's bones and muscles are able to grow and strengthen. Additionally, movement also helps with brain development and coordination.
Babies move in the womb through a combination of reflexes and voluntary movements. As early as 8 weeks gestation, a baby's muscles and nerves begin to develop, allowing them to make spontaneous movements. As they continue to grow, they also develop reflexes, such as the startle reflex, which causes them to move in response to loud noises or sudden movements.
Babies start moving in the womb as early as 8 weeks gestation, but these movements are not typically felt by the mother until around 16-25 weeks. This can vary from pregnancy to pregnancy and can also depend on the location of the placenta.
There are several factors that can affect a baby's movements in the womb. These can include the position of the baby, the amount of amniotic fluid, and the mother's physical activity level. Additionally, certain medications or medical conditions can also impact a baby's movements.
Yes, it is completely normal for a baby to move a lot in the womb. In fact, it is a sign of a healthy and active baby. As the baby grows and develops, their movements may become stronger and more frequent. However, if you notice a significant decrease in your baby's movements, it is important to contact your healthcare provider.