Multiple choice

Which of the following forms of placenta is found in humans?

  1. placenta diffusa

  2. placenta cotyledonaria

  3. placenta zonaria

  4. placenta discoidalis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Humans have a placenta discoidalis (discoid placenta), where chorionic villi are concentrated in one disc-shaped area. Diffusa occurs in horses and whales, cotyledonaria in cows and sheep, and zonaria in carnivores. The discoid structure allows efficient nutrient exchange in a single, compact region.

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