Multiple choice

During embryonic development in humans, morula is enclosed by

  1. corona radiata

  2. zona pellucida

  3. Both (1) and (2)

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The morula stage of embryonic development is enclosed by the zona pellucida, a glycoprotein layer surrounding the oocyte and early embryo. The corona radiata is an outer layer of follicular cells that disperses during fertilization and is not present around the morula stage.

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