Acrosome reaction in sperm is triggered by

[1993]

a)
capacitation

b)
release of lysin

c)
influx of Ca++

d)
release of fertilizin

Correct answer is option 'C'. Can you explain this answer?

Question

Acrosome reaction in sperm is triggered by[1993]a)capacitationb)release of lysinc)influx of Ca++d)release of fertilizinCorrect answer is option 'C'. Can you explain this answer?

Answer

Release of fertilizin and enter in egg

Answer

A is correct as in sperm and ovum there is fertilizin and anti fertilizin reaction takes place and hence sperm penitrates into the ovum

Answer

Abstract. The acrosome reaction that occurs after sperm capacitation, is an exocytotic event induced by a Ca++ influx. It plays an essential role during fertilization, by making spermatozoa able of penetrating the zona and capable of fusing with the egg plasma membrane

Answer

Release of sperm lysin
Bcz sperm lysin contains 1)hyaluronidase that acts as a ground substance of follicle cells
2)corona penetrating enzyme that dissolves the corona radiata
3)zona lysin or arosin that helps in digestion of zona pellucida

Answer

The activated spermatozoan on reaching the egg plasma membrane, undergoes a number of changes in its acrosomal region. All these changes are collectively described under acrosome reaction. Acrosome reaction is calcium-dependent involving massive uptake of calcium with an efflux of hydrogen generating high pH and osmotic pressure, producing negative surface charge, and partial or total release of the acrosomal enzymes Calcium influx may activate phospholipase resulting in accumulation of unsaturated fatty acids and fusiogenic lysophospholipids contributing to
acrosome reaction.

Answer

Acrosome Reaction in Sperm
The acrosome reaction in sperm is a crucial step in the process of fertilization. It is triggered by several factors, with one of the key triggers being the influx of Ca++ ions.

Influx of Ca++
- When the sperm reaches the zona pellucida (the outer layer of the egg), it binds to specific glycoproteins on the surface.
- This binding leads to an influx of calcium ions into the sperm cell.
- The increase in intracellular calcium levels triggers a series of events that ultimately result in the acrosome reaction.

Acrosome Reaction
- The acrosome is a specialized vesicle in the head of the sperm that contains enzymes necessary for penetrating the zona pellucida.
- During the acrosome reaction, the acrosome releases these enzymes, which help the sperm penetrate the zona pellucida and reach the egg for fertilization.
- This process is essential for the sperm to successfully fertilize the egg.
In conclusion, the influx of calcium ions plays a critical role in triggering the acrosome reaction in sperm. This reaction is a key step in the fertilization process, allowing the sperm to penetrate the protective layer of the egg and fertilize it.

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