alleryStart learning →The two protective layers surrounding an ovulated secondary oocyte are the zona pellucida and the:
ABlood-testis barrier
BCorona radiata
CFertilization membrane
DTunica albuginea
Answer & Solution
Correct answer: B. Corona radiata
1. The secondary oocyte does not float freely and unprotected; it carries two protective layers from the ovary.
2. The outer of these two layers is made of follicular (granulosa) cells.
3. This outer layer is called the corona radiata.
4. Beneath it lies the zona pellucida, a glycoprotein membrane, together forming the barrier sperm must penetrate.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 28 "Development and Inheritance", p.1320 §Contact Between Sperm and Oocyte_
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