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The chorion is a membrane that develops at the start of pregnancy. Its main function is to contribute to the formation of the placenta.

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What is the role of the chorion?

The chorion is one of the membranes that exist during pregnancy between the developing fetus and mother. It is formed by extraembryonic mesoderm and the two layers of trophoblast and surrounds the embryo and other membranes.


Compare the functions of a human embryonic membranes with those inside a bird's egg?

The human embryonic membranes, including the amnion, chorion, yolk sac, and allantois, support and protect the developing embryo in the womb by providing nourishment, gas exchange, and waste elimination. In birds, the amnion, chorion, yolk sac, and allantois inside the egg serve a similar function by enclosing the developing embryo and providing necessary nutrients, oxygen, and waste removal for growth and development. Both systems play a vital role in sustaining the developing organism until it is ready to survive independently.


What type of placentation is found in dogs and cats?

Dogs and cats have zonary placentation, where the placenta forms a band around the middle of the fetus's chorion. This type of placentation allows for efficient nutrient exchange between the mother and the developing embryos.


What is the function of camouflage in the wild?

Camouflage is the process of blending into the background. It only works if the predator hunts by looking - animals who hunt by sound or smell are not fooled by camouflage! Many animals have color patterns which match the environment in which they live. If they freeze against this background, they blend in and are harder to see.


What is the function of a rooster's hock?

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