Acrosome Reaction

Acrosome Reaction

During fertilization, a sperm must first fuse with the plasma membrane and then penetrate the female egg in order to fertilize it. Fusing to the egg usually causes little problem, whereas penetrating through the egg's hard shell can present more of a problem to the sperm. Therefore sperm cells go through a process known as the acrosome reaction which is the reaction that occurs in the acrosome of the sperm as it approaches the egg. The acrosome is a cap-like structure over the anterior half of the sperm's head.

As the sperm approaches the zona pellucida of the egg, which is necessary for initiating the acrosome reaction, the membrane surrounding the acrosome fuses with the plasma membrane of the oocyte, exposing the contents of the acrosome. The contents include surface antigens and numerous enzymes which are responsible for breaking through the egg's tough coating and allowing fertilization to occur.

Read more about Acrosome ReactionVariations Among Species, The Process, In in Vitro Fertilization

Other articles related to "acrosome reaction, acrosome, acrosome reactions, reaction":

Acrosome Reaction - In in Vitro Fertilization - Assessment
... can be used for assessing the shedding of the acrosome or "acrosome reaction" of a sperm sample ... Sperm cells with artificially induced acrosome reactions may serve as positive controls ... least 200 cells are viewed in an arbitrary fashion and classified as either acrosome intact (fluorescing bright green) or acrosome reacted (no probe present, or only on the equatorial ...
Human Fertilization - Anatomy - Acrosome Reaction
... The acrosome reaction must occur to mobilise enzymes within the head of the spermatozoon to degrade the zona pellucida ...
Fertilisation in Animals - Mammals
... to sea urchins, the sperm binds to the egg before the acrosomal reaction ... is important for binding with the sperm and activating the acrosome reaction ... After the acrosome reaction, it is believed that the sperm remains bound to the zona pellucida through exposed ZP2 receptors ...