State any three functions of placenta in human female.

Explanation

**Step-by-Step Text Solution:**

1. **Protection Against Infections**: The placenta acts as a barrier that protects the developing fetus from certain infections. It prevents harmful pathogens from passing from the maternal blood to the fetal blood, thereby safeguarding the fetus.

2. **Nutritional Support**: The placenta is responsible for providing essential nutrients to the fetus. It facilitates the transfer of nutrients from the mother's blood to the fetus, ensuring that the developing baby receives the necessary substances for growth and development.

3. **Gas Exchange**: The placenta plays a crucial role in the exchange of gases between the mother and the fetus. It allows oxygen to pass from the maternal blood to the fetal blood while simultaneously facilitating the removal of carbon dioxide from the fetal blood to the maternal blood.