Which extraembryonic membranes in human prevents dissicaation of embryo inside uterus?

Options

A. Amnion
B. Chorion
C. Allantois
D. Yock sac

Answer

To answer the question "Which extraembryonic membranes in humans prevent desiccation of the embryo inside the uterus?", we can break down the information step by step:

### Step-by-Step Solution:

1. **Identify the Extraembryonic Membranes**:
- In humans, there are four extraembryonic membranes: the chorion, amnion, yolk sac, and allantois.

2. **Understand the Function of Each Membrane**:
- **Chorion**: This membrane is involved in the exchange of gases and nutrients between the mother and the embryo.
- **Amnion**: This membrane surrounds the embryo and contains amniotic fluid.
- **Yolk Sac**: Primarily provides nutrients in early development but is not functional in humans as it is in other vertebrates.
- **Allantois**: Involved in waste disposal and gas exchange but is also not fully functional in humans.

3. **Focus on the Amnion**:
- The amnion is crucial as it forms a protective sac around the embryo.

4. **Role of Amniotic Fluid**:
- The amniotic fluid within the amnion serves to cushion the embryo, protect it from physical shocks, and most importantly, prevent desiccation (drying out).

5. **Conclusion**:
- Therefore, the extraembryonic membrane that prevents desiccation of the embryo inside the uterus is the **amnion**.

### Final Answer:
The extraembryonic membrane that prevents desiccation of the embryo inside the uterus in humans is the **amnion**.

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