Qhov sib txawv tseem ceeb ntawm presynaptic neuron thiab postsynaptic neuron yog tias presynaptic neuron koom nrog hauv kev tso cov neurotransmitter thaum lub postsynaptic neuron koom nrog hauv kev txais cov neurotransmitter.
Neurotransmission yog kev xa cov paj hlwb. Cov txheej txheem no yog txheej txheem kev sib koom tes zoo uas tshwm sim los ntawm cov neurons. Lub synapse yog qhov sib txawv ntawm cov hlab ntsha xaus uas yog tsim los ntawm physiologically rau cov paj hlwb impulse kis tau zoo. Feem ntau cov synapses yog tshuaj thiab lwm tus yog hluav taws xob; chemical synapses sib txuas lus siv tshuaj xa xov, thiab hluav taws xob synapses sib txuas lus los ntawm ions ntws ncaj qha ntawm cov hlwb. Ntawm cov tshuaj synapse, postsynaptic neuron tso tawm cov neurotransmitters thaum muaj peev xwm ua tau tshwm sim. Cov molecules tom qab ntawd khi rau cov receptors ntawm cov hlwb postsynaptic kom tua hluav taws muaj peev xwm.
Dab tsi yog Presynaptic Neuron?
Lub presynaptic neuron yog cov neuron uas qhib lub synapse thiab feem ntau ua haujlwm hauv kev tso cov neurotransmitters. Acetylcholine yog lub ntsiab neurotransmitter tso tawm rau lub synapse los ntawm presynaptic neuron. Kev tso tawm ntawm cov neurotransmitter los ntawm presynaptic neuron xaus yuav siv qhov chaw nyob rau hauv cov lus teb rau qhov kev txiav txim muaj peev xwm ncav cuag qhov kawg ntawm lub axon. Yog li, presynaptic neuron lub luag haujlwm tseem ceeb yog ua thiab xa cov paj hlwb nkag mus rau lub synapse.
Daim duab 01: Presynaptic Neuron
Kev tso tawm ntawm cov neurotransmitter los ntawm presynaptic neuron tshwm sim ntawm exocytosis. Presynaptic knobs yog tsim ntawm lub davhlau ya nyob twg ntawm presynaptic neuron. Presynaptic knobs los yog vesicles ces tso cov neurotransmitter mus rau lub synapse. Qhov tso tawm ntawm cov neurotransmitter yog li ua kom qhib cov calcium channel. Qhov no, nyob rau hauv lem, activates lub xaav ntawm lub paj hlwb impulse los ntawm presynaptic neuron mus rau lub synapse. Ua raws li qhov no, postsynaptic neuron koom nrog hauv kev txais lub teeb liab.
Postynaptic Neuron yog dab tsi?
Postsynaptic neuron yog cov neuron uas koom nrog kev txais cov neurotransmitter thaum lub paj hlwb xa mus. Lub postsynaptic neuron tau txais cov neurotransmitter ntawm lub synapse los pab txhawb kev sib kis ntawm qhov ua tau zoo.
Daim duab 02: Postsynaptic Neuron
Qhov kev siv lub cev lub cev no tshwm sim los ntawm kev ua kom cov postsynaptic receptors. Tom qab qhov kev txiav txim no, cov hlab ntsha impulse xa mus rau postsynaptic neuron los ntawm lub synapse. Tom qab ntawd lub ligand gates channels lossis G protein receptors tau qhib, thiab cov teeb liab kis tau tiav. Thaum ua tiav ntawm cov hlab ntsha impulse, depolarization tshwm sim, thiab Calcium channels kaw.
Zoo sib xws ntawm Presynaptic Neuron thiab Postsynaptic Neuron
- Ob leeg presynaptic thiab postsynaptic neurons yog qhov tseem ceeb hauv kev xa paj hlwb.
- Lawv rhiab rau neurotransmitters.
- Ob leeg presynaptic thiab postsynaptic neurons ciam teb rau synapse
- Cov neurons no muaj qhov xaus tshwj xeeb lossis pob qhov rooj.
Qhov txawv ntawm Presynaptic Neuron thiab Postsynaptic Neuron
Qhov sib txawv tseem ceeb ntawm presynaptic neuron thiab postsynaptic neuron yog cov kev taw qhia ntawm kev ua haujlwm neurotransmitter. Thaum lub presynaptic neuron tso tawm cov neurotransmitter, postsynaptic neuron tau txais cov neurotransmitter los pab txhawb kev xa paj hlwb. Lub presynaptic neuron nkag mus rau exocytosis los tso cov neurotransmitter, thaum lub postsynaptic neuron undergoes endocytosis kom tau txais cov neurotransmitter. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm presynaptic neuron thiab postsynaptic neuron.
Cov hauv qab no infographic tabulates qhov sib txawv ntawm presynaptic neuron thiab postsynaptic neuron rau ib sab ntawm kev sib piv.
Summary – Presynaptic Neuron vs Postsynaptic Neuron
Nerve impulse kis ntawm synapse yog kho los ntawm neurotransmitters. Kev tso tawm ntawm cov neurotransmitters yog ib qho tseem ceeb kom tswj tau qhov txuas ntxiv ntawm cov teeb liab kis. Yog li, presynaptic neuron koom nrog hauv kev tso cov neurotransmitter mus rau synapse. Kev tso tawm ntawm cov neurotransmitter los ntawm presynaptic neuron xaus yuav siv qhov chaw nyob rau hauv cov lus teb rau qhov kev txiav txim muaj peev xwm ncav cuag qhov kawg ntawm lub axon. Thaum qhov no, polarization yog qhib, thiab cov calcium gated channel qhib. Acetylycholine yog lub ntsiab neurotransmitter uas tawm mus rau synapse los ntawm presynaptic neuron. Cov postsynaptic neuron koom nrog hauv kev txais cov neurotransmitter kom ua tiav cov paj hlwb impulse kis thoob plaws lub synapse. Tom qab ntawd, depolarization yog qhib thaum lub postsynaptic neuron tau qhib. Yog li, qhov no yog cov ntsiab lus ntawm qhov sib txawv ntawm presynaptic neuron thiab postsynaptic neuron.
