In many cases, signaling factors maintain the stem cell in an uncommitted state.

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#Id: 7582

#Unit 5. Developmental Biology

The membrane potential of the sperm cell becomes more negative as potassium ions leave the sperm. 

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#Id: 7583

#Unit 5. Developmental Biology

Negative membrane potential may allow calcium channels to be opened and permit calcium to enter the sperm. 

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#Id: 7584

#Unit 5. Developmental Biology

Calcium and bicarbonate ions are critical in activating cAMP production and in facilitating the membrane fusion events of the acrosome reaction

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#Unit 5. Developmental Biology

The influx of bicarbonate ions (and possibly other ions) alkalinizes the sperm, raising its pH. This will be critical in the subsequent activation of calcium channels

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#Id: 7586

#Unit 5. Developmental Biology

During capacitation, 

cAMP formation, protein

phosphorylation occurs. 

One of these proteins is Izumo, which is critical in sperm-egg fusion

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#Id: 7587

#Unit 5. Developmental Biology

Connection between sperm translocation

and capacitationbefore entering the ampulla of the oviduct, the uncapacitated sperm bindactively to the membranes of the oviduct cells in the the isthmus) & this bindingis temporary and appears to be broken when the sperm become capacitated