During capacitation, 

cAMP formation, protein

phosphorylation occurs. 

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

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Once an impulse reaches the presynaptic terminals, a response can be obtained in the postsynaptic neuron after a Synaptic delay.

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Synaptic delay is due to the time it takes for the synaptic mediator to be released and to act on the receptors on the membrane of the postsynaptic cell. 

The minimum time for synaptic delay is 0.5 ms

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#Unit 7. System Physiology – Animal

Three states of a neuron

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Excitatory postsynaptic potential (EPSP) is produced by depolarization of the postsynaptic cell membrane immediately under the presynaptic ending

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Excitatory postsynaptic potential (EPSP)

During this potential, excitatory transmitter opens Na+ or Ca2+ channels in the postsynaptic membrane, producing an inward current & the excitability of the neuron to other stimuli is increased

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#Unit 7. System Physiology – Animal

During Inhibitory postsynaptic potential (IPSP) the excitability of the neuron to other stimuli is decreased