Maitiro eKufuridzira Kwetsinga
Kutapurirana kwetsinga dzeropa chinhu chakakosha mutsinga dzeropa, zvichigonesa kutaurirana pakati pema neuron uye pakati pema neuron nedzimwe nhengo dzemuviri. Kunzwisisa kuti mafambiro etsinga dzeropa anofamba sei kunogona kupa ruzivo rwakadzama pamusoro pekuti uropi hwemunhu nemuviri wake zvinoshanda sei. Chinyorwa chino chichatsanangura mashandiro ari kuita izvi, kubva patsananguro huru kusvika pakuti tsinga dzeropa dzinogona sei kukanganisa mashandiro emuviri.
Nhanganyaya kuNeurons
MaNeuron ndiwo mayuniti ekutanga ehurongwa hwetsinga, anoonekwa semasero akasarudzika ane kugona kutumira nekugamuchira masaini emagetsi. Maumbirwo eneuron ane zvikamu zvikuru zvitatu: muviri wesero (soma), dendrites, uye axons. MaDendrites ishinda pfupi dzinogamuchira masaini uye dzinoatumira kumuviri wesero, nepo axons ishinda refu dzinotakura masaini kubva mumuviri wesero kuenda kune mamwe maneuron kana masero e effector.
Kugona kweNyeredzi
Kuti unzwisise maitiro ekufambisa kwetsinga, zvakakosha kunzwisisa pfungwa yesimba re membrane. Ma neuron ane semi-permeable membranes, izvo zvinoita kuti pave ne specific ion concentration gradients. Mumamiriro ekuzorora, mukati me neuron mune negative charge zvichienzaniswa nekunze. Mamiriro aya anonzi resting potential, ayo anotangira pa -70 mV.
Kugona Kuita
Maitiro makuru mukufambisa kwetsinga dzeropa (nerve impulse transmission) isimba rekuita, shanduko inokurumidza musimba re membrane voltage inofamba ichitevedza axon ye neuron. Simba rekuita rinotanga kana neuron yawana simba rakasimba, zvichikonzera shanduko yekutanga musimba re membrane kupinda mu sodium ions (Na+).
1. Kubvisa polarization - Chinhu chinosimudzira chinoita kuti nzira dzeNa+ ion dzivhurike, zvichiita kuti Na+ ipinde musero. Izvi zvinoita kuti membrane charge ichinje kubva pakuva negative kuenda kune yakanaka.
2. Kudzoreredza masero eropa – Mushure mekudzikira kwemasero eropa, nzira dzeNa+ dzinotanga kuvhara ukuwo nzira dzepotassium (K+) dzichivhurika, zvichiita kuti K+ ibude musero. Maitiro aya anodzosera membrane charge kumamiriro asina kunaka.
3. Hyperpolarization – Kana K+ yakawandisa yabuda, membrane ye neuron inova negative kupfuura rest potential, isati yagadzikana zvakare.
Kutungamira kweMhepo
Mashandiro ekuita anowanzo tanga pa axon hillock ofamba ne axon achienda ku axon terminal. Kune mhando mbiri dzinozivikanwa dzekufambisa: continuous conduction uye saltatory conduction:
– Kuenderera mberi kwekufambisa kunoitika muma axon asina myelin uko simba rekuita rinofanira kugadzirwa zvakatevedzana pamwe chete ne axon.
– Kutungamirwa kwemunyu kunoitika mumasero emhasuru apo ma "impulses" anosvetuka kubva pane rimwe node reRanvier kuenda kune rimwe, zvichikurumidzisa kutumirwa kwema "impulse".
Kutapurirana kweSinaptic
Kana simba rekuita rikasvika pa axon terminal, chiratidzo chemagetsi chinoshandurwa kuita chiratidzo chemakemikari chinofamba nepakati pe synaptic cleft kuenda ku neuron inotevera. Maitiro aya anosanganisira:
1. Kuburitswa kwema neurotransmitters: Zvinogona kuita basa zvinoita kuti ma vesicles ane ma neurotransmitters afambe achienda ku presynaptic membrane oburitsa zviri mukati mawo mu synaptic cleft.
2. Kupararira kweneurotransmitter pakati pemukana uye kubatana nemareceptors ari pa membrane ye postsynaptic.
3. Kutanga kwePost-synaptic Potential: Zvichienderana nerudzi rwe neurotransmitter ne receptor, izvi zvinogona kugadzira excitatory postsynaptic potential (EPSP) kana inhibitory postsynaptic potential (IPSP), zvichikonzera kana neuron inotevera ichizogadzira action potential.
Zvinhu Zvinokanganisa Maitiro Ekuita Kwetsinga
Maitiro ekufambisa kwetsinga anokonzerwa nezvinhu zvakasiyana-siyana:
– Dhayamita yeAxon: MaAxon ane dhayamita yakakura achaita kuti ma impulses amhanye nekukurumidza kupfuura maaxon madiki.
– Tembiricha: Kuwedzera kwetembiricha kunogona kuwedzera kumhanya kwekufambisa kwemhepo.
– Kuvapo kweMyelin: Sezvambotaurwa, kuburitswa kwemhasuru kunowedzera kumhanya kwekufambisa kwemhasuru.
– Electrolyte Balance: MaIon akadai seNa+, K+, uye Ca2+ akakosha pakuenzanisa kugona kwemembrane uye kugona kwekuita.
Kushandiswa kweKunzwisisa Kumanikidzwa Kwetsinga
Kunzwisisa tsinga dzinoita kuti munhu anzwe kumanikidzwa kunoshanda zvikuru muzvikamu zvakasiyana-siyana, zvinosanganisira:
– Mushonga: Kuongorora nekurapa zvirwere zvetsinga zvakaita sepfari, multiple sclerosis, uye neuropathy.
– Pharmacology: Kugadzirwa kwemishonga inochinja mashandiro ema neurotransmitter, inoshandiswa mukurapa zvirwere zvakaita sekuora mwoyo uye schizophrenia.
– Neurotechnology: Kugadzirwa kwemidziyo yekugadzira nhengo dzemuviri inogona kubatanidzwa nehurongwa hwetsinga kuti ibatsire varwere vane kurasikirwa nekushanda kwetsinga kana mafambiro emuviri.
Mhedziso
Maitiro ekufambisa tsinga ibasa rakaomarara remaitiro emagetsi nemakemikari, zvichiita kuti kutaurirana kubudirire mukati mehurongwa hwetsinga. Kubva pakubviswa kwepolarization kusvika pakufambiswa kwesynaptic, danho rega rega rinoita basa rakakosha mukuona kuti muviri unopindura nekukurumidza uye zvakakodzera kune zvinokurudzira. Kufambira mberi munguva pfupi yapfuura mukutsvagisa netekinoroji kuri kuramba kuchidzamisa kunzwisisa kwedu kwekuti maitiro aya haangotsigiri hupenyu chete asiwo anotungamira hunyanzvi mune dzakasiyana siyana dzesainzi nedzekurapa. Kunzwisisa nekugadzirisa maitiro aya kunovhura mikana yakawanda yekuvandudza marapirwo emangwana netekinoroji inogona kuvandudza zvakanyanya kunaka kwehupenyu hwevanhu.
