Sperm surface Ca²⁺ influx triggers exocytosis of acrosomal hydrolases, enabling penetration of zona pellucida. Followed by membrane fusion + cortical reaction blocking polyspermy.
Sperm surface Ca²⁺ influx triggers exocytosis of acrosomal hydrolases, enabling penetration of zona pellucida. Followed by membrane fusion + cortical reaction blocking polyspermy.