The initial observation was that the germination of lettuce seeds is stimulated by red light and inhibited by farred light.

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

TLS Online TPP Program

#Id: 5475

#Unit 7. System Physiology – Animal

Postsynaptic inhibition occurs when an inhibitory transmitter (eg, glycine, GABA) is released from a presynaptic nerve terminal onto the postsynaptic neuron.

TLS Online TPP Program

#Id: 5476

#Unit 7. System Physiology – Animal

The synapse between a motoneuron and a muscle fiber is called the neuromuscular junction

TLS Online TPP Program

#Id: 5477

#Unit 7. System Physiology – Animal

Action potentials are propagated down the motoneuron, depolarize each adjacent region to threshold. Finally, the presynaptic terminal is depolarized, and this depolarization causes voltage-gated Ca2+ channels in the presynaptic membrane to open.