phyB–phyE, appear mostly light-stable in the plant and function primarily in the regulation of LFRs and of shade avoidance involving changes in the R:FR ratio.

TLS Online TPP Program

#Id: 5469

#Unit 7. System Physiology – Animal

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

TLS Online TPP Program

#Id: 5470

#Unit 7. System Physiology – Animal

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

TLS Online TPP Program

#Id: 5471

#Unit 7. System Physiology – Animal

Three states of a neuron

TLS Online TPP Program

#Id: 5472

#Unit 7. System Physiology – Animal

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

TLS Online TPP Program

#Id: 5473

#Unit 7. System Physiology – Animal

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

TLS Online TPP Program

#Id: 5474

#Unit 7. System Physiology – Animal

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