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Explain why the student continued to breathe heavily even after the race had ended.

Biology

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2. (b) Andika mlinganyo wa kemikali kwa aina ya upumuaji iliyotajwa katika (a) hapo juu.

Jibu la mwanafunzi katika 2(a) lilitaja "Aerobic respiration". Hata hivyo, wakati wa mbio fupi kali (sprint) kama mita 400, misuli hufanya upumuaji usio na hewa (anaerobic respiration) kwa sababu ya upungufu wa oksijeni, na kusababisha mkusanyiko wa asidi ya laktiki. Mlinganyo wa kemikali kwa upumuaji usio na hewa (fermentation ya asidi ya laktiki) ni:

C6H12O6→2C3H6O3+Nishati\text{C}_6\text{H}_{12}\text{O}_6 \to 2\text{C}_3\text{H}_6\text{O}_3 + \text{Nishati}

Glukosi →\to Asidi ya laktiki + Nishati

2. (c) Eleza kwa nini mwanafunzi aliendelea kupumua sana hata baada ya mbio kuisha.

Mwanafunzi aliendelea kupumua sana ili kulipa deni la oksijeni (oxygen debt). Wakati wa mbio, misuli ilifanya upumuaji usio na hewa, na kusababisha mkusanyiko wa asidi ya laktiki. Asidi hii inahitaji kuvunjwa kuwa kaboni dioksidi na maji, mchakato unaohitaji oksijeni ya ziada. Kupumua sana huhakikisha oksijeni ya kutosha inapatikana ili kuondoa asidi ya laktiki.

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