Quick Answer: What Harmful Substances Can Pass Through The Placenta?

What chemicals can harm a fetus?

Chemicals to avoid when you’re pregnant or breastfeedingPesticides and herbicides.

Some pesticides (bug killers) and herbicides (weed killers) are known to affect developing and newborn babies.

Cleaning products.


Mosquito repellent.


Arsenic-treated timber.

Nail polish.

Paint and lead-based products.More items….

Does medication pass through placenta?

Most drugs of abuse easily cross the placenta and can affect fetal brain development. In utero exposures to drugs thus can have long-lasting implications for brain structure and function.

Can chemicals cause miscarriage?

Exposure to pesticides could increase your chances of having a miscarriage, a baby with birth defects, or other problems. Some pesticides also may be able to pass into breast milk. Here, you can learn more about these chemicals and what you can do to reduce your exposure for a healthier pregnancy.

Is bending down safe during pregnancy?

Bending and lifting. Even when you’re lifting something light, proper form can spare your back. Bend at your knees, not your waist.

Does the placenta transport oxygen?

Oxygen is a small molecule which readily crosses the placenta by passive diffusion. Oxygen transfer mainly depends on the oxygen partial pressure gradient between maternal blood in the intervillous space and fetal blood in the umbilical arteries (∼4 kPa). Oxygen transfer to the fetus is enhanced by the Bohr effect.

What substances are exchanged between the mother and the fetus?

The mother’s blood does not mix with the blood of the fetus, but the placenta lets substances pass between the two blood supplies:oxygen and nutrients diffuse across the placenta from the mother to the fetus.carbon dioxide and other waste substances diffuse across the placenta from the fetus to the mother.

What can pass through the placenta?

Blood from the mother passes through the placenta, filtering oxygen, glucose and other nutrients to your baby via the umbilical cord. The placenta also filters out substances that could be harmful to your baby and removes carbon dioxide and waste products from your baby’s blood.

What drugs do not cross the placenta?

Alcohol, for example, readily reaches the embryo in fairly high concentrations. On the other hand, high molecular-weight drugs like heparin (20,000 daltons) do not cross the placenta. It is therefore widely used to treat hypercoagulation during pregnancy.

What substances are exchanged in the placenta?

The placenta allows substances to diffuse from the mother’s blood to the foetus (e.g. oxygen and glucose). Substances can also diffuse from the foetus to the mother’s blood (e.g. carbon dioxide and urea ). The placenta is adapted for diffusion by having: A large surface area between it and the uterus wall.

What does a big placenta mean?

Both large and small placenta can pose a risk However, when the baby is small and the placenta is large, this may be a sign of poor conditions in the uterus. “We know that a large placenta relative to the child’s size may indicate that the child was exposed to a harmful environment during pregnancy,” says Larsen.

Which does not cross placenta?

Insulin is the preferred pharmacological treatment in pregnancy because it is unable to cross the placenta due to its large molecular weight (6000 Da). However, insulin is not without its shortcomings.

Does Tylenol cross placenta?

Still, acetaminophen and its metabolites freely cross the placenta and have been found in cord blood, newborn urine, and fetal liver, suggesting the potential for direct fetal toxicity [5–7].

Is it safe to clean bathroom while pregnant?

Unfortunately, ladies, most products are safe to use for cleaning during pregnancy. Yes, even bleach. So you don’t have to call a maid to do the household cleaning unless you want to.

Does water pass through the placenta?

True, water flows into the fetus through the placenta since little water is exchanged at any other interface between mother and conceptus (Anderson et al., 1990). But trans-placental water flow is modulated by the fetal kidneys.