Drugs that crosses placenta is
**Core Concept**
Drugs that cross the placenta are substances that can pass from the maternal bloodstream into the fetal bloodstream, potentially affecting fetal development and well-being. This process is influenced by factors such as the drug's molecular weight, lipid solubility, and the presence of specific transport mechanisms.
**Why the Correct Answer is Right**
Drugs that are lipid-soluble and have a molecular weight less than 500 Da are more likely to cross the placenta. This is because the placental membrane is highly permeable to lipid-soluble substances, allowing them to diffuse freely. Additionally, certain transport mechanisms, such as passive diffusion and facilitated diffusion, can also facilitate the transfer of drugs across the placenta.
**Why Each Wrong Option is Incorrect**
**Option A:** Not enough information is provided to determine why this option is incorrect.
**Option B:** This option may be incorrect because it doesn't specify the characteristics of the drug that would allow it to cross the placenta.
**Option C:** This option may be incorrect because it doesn't provide any information about the drug's ability to cross the placenta.
**Clinical Pearl / High-Yield Fact**
It's essential to consider the potential effects of drugs on fetal development and well-being when prescribing medications to pregnant women. A thorough understanding of the factors that influence placental transfer can help clinicians make informed decisions about medication use during pregnancy.
**Correct Answer:** C.