Place the following events of fertilization in the correct chronological order.
(1) Sperm contacts the cumulus mass.
(2) Proteolytic enzymes are released from the acrosome.
(3) Sperm contacts the plasma membrane of the ovum.
(4) Sperm passes through the zona pellucida.
(5) Sperm increase ATP production.

Question

Quizplus · Accepted Answer

The correct sequence for the events of fertilization starts with the sperm increasing ATP production (5) to power its journey towards the egg. It then contacts the cumulus mass surrounding the egg (1), releases proteolytic enzymes from the acrosome to digest the layers around the egg (2), passes through the zona pellucida which is the outer layer of the egg (4), and finally contacts the plasma membrane of the ovum to fertilize it (3).

Place the Following Events of Fertilization in the Correct Chronological