In the slow block to polyspermy,sperm penetration releases an inflow of __________,which in turn stimulates the __________. A) Cl^-;corona radiata B) K⁺;zona pellucida C) Na⁺;fertilization membrane D) Ca²⁺;fertilization membrane E) Ca²⁺;cortical reaction

Question

Quizplus · Accepted Answer

Sperm penetration releases an influx of calcium ions which stimulate the cortical reaction, not the other options mentioned. The cortical reaction causes the release of cortical granules that modify the zona pellucida and prevent the entry of additional sperm.

In the Slow Block to Polyspermy,sperm Penetration Releases an Inflow