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The placental barrier between the matern...

The placental barrier between the maternal and foetal blood is minimum in

A

Goat

B

Pig

C

Cow

D

Human

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**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the species in which the placental barrier between maternal and fetal blood is the minimum. This implies we need to compare the types of placental barriers across different species. 2. **Identifying the Types of Placental Barriers**: - In species like goats, pigs, and cows, the type of placenta is known as **epithelio-chorial**. In this type, the maternal blood is separated from the fetal blood by several layers, including the maternal epithelium, connective tissue, and endothelium. - In humans, the type of placenta is called **hemocorial**. Here, the fetal blood is in direct contact with the maternal blood, meaning there are fewer layers separating them. 3. **Comparing the Placental Types**: - Epithelio-chorial (goats, pigs, cows): There are multiple layers (maternal epithelium, connective tissue, and endothelium) that act as barriers between maternal and fetal blood. - Hemocorial (humans): The fetal blood is in direct contact with maternal blood, resulting in a minimal barrier. 4. **Conclusion**: Since the hemocorial type has the least separation between maternal and fetal blood, the species with the minimum placental barrier is **humans**. 5. **Final Answer**: The correct option is **humans**. ---
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the species in which the placental barrier between maternal and fetal blood is the minimum. This implies we need to compare the types of placental barriers across different species. 2. **Identifying the Types of Placental Barriers**: - In species like goats, pigs, and cows, the type of placenta is known as **epithelio-chorial**. In this type, the maternal blood is separated from the fetal blood by several layers, including the maternal epithelium, connective tissue, and endothelium. - In humans, the type of placenta is called **hemocorial**. Here, the fetal blood is in direct contact with the maternal blood, meaning there are fewer layers separating them. ...
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