Nā Pae o ka Hanu Aerobic: He Kaʻina Hana Koʻikoʻi no ke Ola
ʻO ka hanu aerobic kahi hana biochemical koʻikoʻi e hana ʻia i loko o nā cell o nā meaola ola e hana i ka ikehu. ʻO kēia kaʻina hana he ʻāpana o ka metabolism kahi e hoʻohana ʻia ai ka oxygen e oxidize i nā molekala glucose, e hopena ana i ka ikehu ma ke ʻano o adenosine triphosphate (ATP). ʻOkoʻa ka hanu aerobic mai ka hanu anaerobic no ka mea e pili ana i ka oxygen a ʻoi aku ka maikaʻi o ka hana ʻana i ka ikehu. E wehewehe kēia ʻatikala i nā pae o ka hanu aerobic, nona nā pae nui ʻehā: glycolysis, oxidative decarboxylation, ka pōʻaiapuni waikawa citric (pōʻaiapuni Krebs), a me ke kaulahao lawe electron.
1. Glycolysis: Ka Hoʻomaka ʻana o ka Wehe ʻana o ka Glucose
ʻO Glycolysis ka pae mua o ka hanu aerobic, e hana ʻia ana ma ka cytoplasm o ke kelepona. ʻOiai he ʻāpana ia o ka hanu aerobic, ʻaʻole pono ka glycolysis i ka oxygen a no laila hiki ke hana ma lalo o nā kūlana aerobic a me anaerobic. Hoʻololi kēia kaʻina hana i hoʻokahi mole glucose (nona nā ʻātoma kalapona ʻeono) i ʻelua mau mole pyruvate (pākahi me ʻekolu mau ʻātoma kalapona).
ʻO ka Glycolysis he ʻumi mau hopena enzymatic paʻakikī, akā hiki ke hoʻokaʻawale ʻia i ʻelua mau pae nui: ka pae hoʻopukapuka ikehu a me ka pae hoʻopuka ikehu. I ka pae hoʻopuka ikehu, hoʻopau ke kelepona i ʻelua mau mole ATP e hoʻomaka i ka wāwahi ʻana o ka glucose. Eia kekahi, i ka pae hoʻopuka ikehu, ʻehā mau mole ATP a me ʻelua mau mole NADH i hana ʻia, e hopena ana i ka loaʻa ʻana o ʻelua ATP no kēlā me kēia mole glucose.
ʻO nā hopena nui e kū mai ana i ka glycolysis e komo pū ana me ka phosphorylation o ka glucose, ka māhele ʻana o ka fructose 1,6-bisphosphate i ʻelua mau molekala ʻekolu-kalapona, a me ka oxidation o ka triose phosphate e hana i ka pyruvate. ʻO ka huahana hope loa o ka glycolysis, pyruvate, a laila hana hou ʻia i loko o ka mitochondria o ke kelepona.
2. Oxidative Decarboxylation: Hoʻololi ʻana o Pyruvate i Acetyl CoA
Ma hope o ka glycolysis, ua lawe ʻia ʻelua mau molekala pyruvate i loko o ka mitochondria no ka lua o ka pae o ka hanu aerobic, ʻo ia hoʻi ka oxidative decarboxylation. I kēia pae, hana kēlā me kēia molekala pyruvate i ka decarboxylation a me ka hoʻonui ʻana e hana i ka acetyl CoA (acetyl coenzyme A), kahi e komo ai i ka pōʻaiapuni waikawa citric.
Pili kēia kaʻina hana i kahi hui enzyme i kapa ʻia ʻo pyruvate dehydrogenase. I loko o kēia hopena, nalowale ka pyruvate i hoʻokahi ʻātoma kalapona ma ke ʻano o ke kalapona ʻokikene a ua oxidized ʻia e NAD+, e hana ana iā NADH. ʻO kekahi mea koʻikoʻi, kahi hui acetyl ʻelua-kalapona, e hui pū me ka coenzyme A e hana i ka acetyl CoA.
ʻAʻole wale ka decarboxylation oxidative he mea nui no ka hanu aerobic akā he kiko hoʻoponopono koʻikoʻi hoʻi no nā kaʻina hana metabolic ʻē aʻe. ʻO ka huahana o kēia pae, ʻo acetyl-CoA, he mole koʻikoʻi ia i nā ala metabolic like ʻole, me ka lipid a me ketone biosynthesis.
3. ʻO ke Kaʻapuni Waikawa Citric: He Hanana Ikehu Pili Loa
ʻO ke kolu o ka pae o ka hanu aerobic ka pōʻaiapuni waikawa citric, i ʻike ʻia hoʻi ʻo ke pōʻaiapuni Krebs a i ʻole ke pōʻaiapuni waikawa tricarboxylic (TCA). Hana ʻia kēia kaʻina hana i loko o ka matrix mitochondrial a pili i kahi moʻo o nā hopena enzymatic e hoʻopau ai i ka acetyl CoA i carbon dioxide.
Hoʻomaka ke kaʻina hana i ka wā e hui pū ai ka acetyl CoA me ka oxaloacetate e hana i ka citrate, a laila e loli like ʻole, e hana ana i ʻelua mau molekala kalapona dioxide, hoʻokahi ATP (a i ʻole GTP), ʻekolu NADH, a hoʻokahi FADH2 no kēlā me kēia acetyl CoA i oxidized. A laila hana kēia mau NADH a me FADH2 ma ke ʻano he mea lawe uila i nā ʻanuʻu ma hope.
He mea nui nō hoʻi ke kaʻina hana waikawa citric no ka hana hou ʻana o ka oxaloacetate, kahi i hoʻohana hou ʻia i loko o ke kaʻina hana a hāʻawi i nā mea mua koʻikoʻi no ka biosynthesis o nā biomolecules he nui. ʻOiai he liʻiliʻi wale nō ka nui o ATP i hana pololei ʻia e kēia kaʻina hana, ʻo ka NADH a me FADH2 i hana ʻia he kuleana koʻikoʻi i ka hana ikehu holoʻokoʻa i ka wā o ka hanu aerobic.
4. Kaula Hoʻoili Uila: Ka Hana ʻana o ka ATP Kiʻekiʻe
ʻO ke kahua hope loa o ka hanu aerobic ʻo ia ke kaulahao lawe electron, kahi e hana ʻia ma ka membrane mitochondrial o loko. Pili kēia kahua i kahi moʻo o nā hui protein e hoʻoili i nā electrons mai NADH a me FADH2 i ka oxygen, e hana ana i ka wai a hoʻolalelale i ka hana ATP.
Pili kēia kaʻina hana i kekahi mau ʻanuʻu koʻikoʻi: lawe ʻia nā electrons mai NADH a me FADH2 ma o nā complexes enzyme i loko o ka membrane mitochondrial, e like me nā complexes I-IV. I loko o kēia hoʻoili ʻana, hoʻopuka ʻia nā protons mai ka matrix mitochondrial i loko o ka hakahaka intermembrane, e hana ana i kahi gradient proton.
A laila hoʻohana ʻia kēia gradient e ATP synthase e synthesize i ka ATP mai ADP a me ka phosphate, ma ke kaʻina hana i kapa ʻia ʻo oxidative phosphorylation. Hana ka oxygen ma ke ʻano he mea hoʻokipa electron hope loa a hui pū me nā protons e hana i ka wai. ʻO ka oxidative phosphorylation ke kumu mua o ka hana ʻana o ATP i ka hanu aerobic, me 34 mau mole ATP i hana ʻia no kēlā me kēia mole glucose.
Hopena: Ke Koʻikoʻi o ka Hanu Aerobic
ʻO ka hanu ʻana o ka ea kekahi o nā kaʻina hana koʻikoʻi e hoʻokele ana i ke ola i loko o nā meaola aerobic. Ma o nā pae o ka glycolysis, oxidative decarboxylation, ka pōʻaiapuni waikawa citric, a me ke kaulahao lawe electron, hiki i nā meaola ke wāwahi i nā molekole glucose e hoʻokuʻu i ka ikehu a mālama iā ia ma ke ʻano o ATP. He mea nui kēia kaʻina hana ʻaʻole wale no ka ikehu akā no nā ala metabolic ʻē aʻe he nui i loko o ke kino.
ʻO ka hoʻomaopopo ʻana i nā pae o ka hanu aerobic e hāʻawi i ka ʻike hohonu i ke ʻano o ka hoʻohana ʻana o nā cell i ka ikehu a me ka mālama ʻana i kā lākou mau kumuwaiwai. Eia kekahi, hiki i kahi noiʻi piha ʻana i ka hanu aerobic ke hoʻomākaukau i ke ala no nā hopena i nā pilikia olakino like ʻole e pili ana i ka metabolism a me ka ikehu i loko o ke kino o ke kanaka. No laila, ʻaʻole wale ka hanu aerobic he hana biochemical, akā he mea nui hoʻi i ko kākou ola a me ke olakino.
