Vasoconstriction chimiro chemuviri chinokonzera hupamhi hwetsinga dzeropa remuviri kudzikira nekudzvinyirira tsandanyama dzinoumba mutsetse wemidziyo yeropa (tsinga, tsinga). Inogona kukonzerwa nezvikonzero zvinoverengeka uye zvikonzero, asi chero zvakadaro mhinduro yekukurumidza kune inofanirwa kuchinjika, kunyanya kumisa kubuda kweropa.

Vasoconstriction chiitiko chechisikigo chine kudzikisira hupamhi hwetsinga dzeropa, nekudzvinyirira kwetsinga dzayo dzemhasuru. Kuita kwayo kwakapesana kunoenderana nevasodilation; mafambiro ese ari maviri anosanganisira chinonzi vasomotricity.

Vasoconstriction ine basa rekudzora, semuenzaniso, kubuda ropa kana ronda reropa reropa rikaonekwa. Ichi chikamu chekutanga cheheestasis. Iyo vasoconstrictor nerve nzvimbo dziri panotangira iyi michina, asiwo mahormone angiotensin, adrenaline uye noradrenaline. Vasoconstriction saka inokonzera kuderera kweropa kuyerera kunhengo iri kutaurwa. Meso echikepe anozonamira pamwe chete, anova anonamira.

Pane zvinhu zvinoverengeka zvinokonzeresa vasoconstriction mumuviri. Izvo zvinowanzoitika kukuvadzwa kwemasero etsandanyama, ane tsinga dzeropa, nekumanikidza, dzinomisa kubuda kweropa.

Zvimwe zvinhu zvinokonzeresa kuomesa uku:

• Serotonin, yakaburitswa nemaplatelet;
• Kumisikidza kwemarwadzo ekugashira achipfuura nemukati memitsipa (catecholamines, adrenaline, noradrenaline);
• Imwe chepfu kana zvigadzirwa zviripo muchikafu (caffeine semuenzaniso).

Kunze kwezvikonzero izvi zvekutanga, iyo vasoconstriction mashini inogona kumisikidzwa panguva yekugadzirisa kwekutsinhana kwekupisa mumuviri, inosanganisira huta, endocrine, moyo uye mweya wekufema.

Kana tembiricha yemuviri ichidonha, panguva yekutonhora zvakanyanya semuenzaniso, munhu anogona kucherechedza kutaridzika kweasoconstriction yakagurwa: ichi chiitiko chinogonesa kupatsanura mativi epakati epakati pomuviri. Kudzikisira kwehupamhi hwetsinga dzeropa padanho remuviri kune simba rekugadzirisa "gradient" (mutsauko) mukushisa pakati peganda nenhengo dzemwoyo, mapapu, huropi, itsvo. Inoperekedzwa nearterial hypertension uye kuwedzera kwetoni yenzira yetsinga, iyi vasoconstriction saka inowedzera kurova kwemoyo. Izvi zvinotungamira mukuwedzera kwe10% muyero yeplasma yemasero matsvuku uye machena eropa, maplatelet, asi zvakare cholesterol uye fibrinogen. Mhedzisiro: kuwedzera kweropa viscosity yakatenderedza 20%.

Mukupedzisa, kana muviri wako ukaiswa pasi pechando, iyo yemukati thermostat inozvitenderera otomatiki uye ichipisa huwandu hwakakura hwesimba. Zvinodiwa nemoyo uye oxygen zvinodiwa zvinowedzerawo.

Kushungurudzika, kuita? 

Zvakare, kushushikana kunogona zvakare kuve nebasa rekuita vasoconstriction. Nechiito cheadrenaline, kutumira meseji yekushushikana, ngarava dzichashanda kusimbisa dhayamita, kwechinguva.

Nicotine

Nicotine inokonzera vasoconstriction mutsinga, ichideredza kuyerera kweropa, uye nekudaro huwandu hweoxygen hwunopihwa kumatukisi nehupfu hunobviswa kubva munyama imwe chete.

Iyi vasoconstriction inodzoserwa uye inonyangarika maawa mashoma mushure mekuputa. Vasoconstriction inova yechigarire mukati mezuva, kune vakakwira mwero vanosvuta.

Zvirwere zvinogona kuitika

Chekupedzisira, vasoconstriction inogona kuve chiratidzo cheanogona chirwere, kudhakwa kana envenomation. Semuenzaniso, chirwere chaRaynaud chinoratidzwa nekunyanyisa vasoconstriction yemidziyo midiki mumigumo yemuviri (maoko, tsoka), kunyanya panguva yekutonhora kana kushushikana. Chirwere ichi chinokonzeresa kurasikirwa neropa kunzvimbo yakakanganiswa uye kurwadziwa kana kuyerera kweropa kuchidzokera kunzvimbo idzodzo.

Vasoconstriction inogona kukonzerwa nekurapa zvinodhaka, kuitira kudzikamisa kumwe kubuda kweropa mune mamwe mamiriro.

Iko kufamba kwevascular ndiko kukanganisa kunopesana kwevasoconstriction uye nekudaro kunoenderana nekuwedzera kwehukuru hweidziyo nekuwedzera.

Uku kuwedzera kunoitwa kugoneka nekuzorora kwemhasuru dzakakomberedza tsinga dzeropa.

Zvinokonzera vasodilation ndezvi:

• Kupisa ;
• Kurwara, chepfu, envenomation;
• Allergic, kuzvimba maitiro (edema);
• Doro rine vasodilator maitiro uye rinoderedza tsinga dzeropa muuropi;
• Zvinokonzerwa nemushonga, senge hypertensive zvinodhaka.

Mune ino yekupedzisira kesi, munhu ane hypertensive ane midziyo iyo "yakamanikana" kuti iropa riiswe mutsinga dzavo, zvichikuvadza. Saka tichazoshandisa mushonga kudzora midziyo yayo kuitira kudzikisa BP.