The human placenta can be called as

Options

A. haemochorial and chorioallantoic
B. syndesmochorial and amnioallontoic
C. haemochorial and amnioallantoic
D. syndesmochorial and chorioallantoic

Answer

**Step-by-Step Solution:**

1. **Understanding the Placenta**: The placenta is a vital organ that develops during pregnancy, allowing for nutrient and gas exchange between the mother and the developing embryo.

2. **Types of Placenta**: There are different types of placentas based on their structure and the way they interact with maternal tissues. The two main types mentioned are:
- Hemochorial placenta
- Syndesmochorial placenta

3. **Hemochorial Placenta**: This type of placenta is characterized by direct contact between the chorionic villi (finger-like projections from the placenta) and the mother's blood. This allows for efficient nutrient and gas exchange. In humans, the placenta is classified as hemochorial because the chorionic villi penetrate the maternal tissue, allowing maternal blood to come into direct contact with the fetal tissues.

4. **Syndesmochorial Placenta**: In this type, the maternal blood does not come into direct contact with the chorionic villi. Instead, the chorion is in contact with the connective tissue of the uterus. This type is found in some animals, such as ruminants.

5. **Chorioallantoic Placenta**: This is another term used to describe the placenta in humans. It refers to the fusion of the chorion and the allantois, which is another embryonic membrane. This type of placenta is also present in humans and is essential for the exchange of gases and nutrients.

6. **Conclusion**: Based on the types of placentas and their characteristics, the human placenta can be referred to as both a **Hemochorial placenta** and a **Chorioallantoic placenta**.

**Final Answer**: The human placenta can be called a **Hemochorial placenta** and a **Chorioallantoic placenta**.

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