What is placenta? Explain its function in humans.
Answer:
Placenta is a special tissue connection between embryo and uterine wall. It acts as an endocrine gland.
Role of placenta:
- It possesses villi that increase the surface area for absorption of nutrients.
- Facilitates passage of nutrition and oxygen to embryo from mother through blood.
- Waste substances produced by embryo are removed through placenta into mother’s blood.