Sciences - Co-ordinated (9-1) - 0973 CIE

Respiration (continued)

Gbogbo ọrọ náà

Sometimes a cell needs energy but cannot get oxygen fast enough, for example a sprinter's leg muscles or a yeast cell deep in dough. In these situations cells switch to anaerobic respiration, releasing energy without oxygen, though at a cost.

In this lesson you will learn what anaerobic respiration is, why it gives so much less energy than aerobic respiration, and the different products it makes in yeast and in human muscle. You will also meet the idea of an oxygen debt, the price your body pays for exercising anaerobically.

Ebumnobi

  1. Describe anaerobic respiration as the chemical reactions in cells that break down nutrient molecules to release energy without using oxygen
  2. State that anaerobic respiration releases much less energy per glucose molecule than aerobic respiration
  3. State the word equation for anaerobic respiration in yeast as: glucose → alcohol + carbon dioxide
  4. State the word equation for anaerobic respiration in muscles during vigorous exercise as: glucose → lactic acid
  5. [Supplement] State the balanced chemical equation for anaerobic respiration in yeast as: C H O → 2C H OH + 2CO 6 12 6 2 5 2
  6. [Supplement] State that lactic acid builds up in muscles and blood during vigorous exercise causing an oxygen debt

Nkuzi Olu

Gee ntị na nkuzi a na ngwa

Maapụ uche

E seela isiokwu a ka ị hụ otu echiche si ejikọta.

Mepee maapụ uche na ngwa

Kaadị ncheta

Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.

Mee omume kaadị ndị a na ngwa

Akwụkwọ Ọmụmụ

Anaerobic respiration keeps cells working when oxygen runs short. It powers a sprint finish, lets yeast make bread and beer, and explains the burning, tired feeling in muscles during hard exercise. The equations and the idea of an oxygen debt are common exam targets.

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Nnyocha Ọmụmụ

Ekele diri gi maka imecha ihe karịrị na Respiration (continued). Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

  1. The products of anaerobic respiration in yeast are: A. carbon dioxide and water B. lactic acid only C. alcohol and carbon dioxide D. glucose and oxygen Answer: C
  2. The product of anaerobic respiration in human muscle is: A. alcohol B. lactic acid C. carbon dioxide D. water Answer: B
  3. Compared with aerobic respiration, anaerobic respiration releases: A. more energy per glucose B. the same energy per glucose C. much less energy per glucose D. no energy Answer: C
  4. The balanced equation for anaerobic respiration in yeast is: A. C6H12O6 + 6O2 -> 6CO2 + 6H2O B. C6H12O6 -> 2C2H5OH + 2CO2 C. C6H12O6 -> lactic acid D. 2C2H5OH -> C6H12O6 Answer: B
  5. Lactic acid building up in muscles during exercise causes: A. a glucose debt B. an oxygen debt C. a carbon dioxide debt D. a water debt Answer: B

Rue ajuju ndi a n'ime ngwa ahu

Rue ajuju ndi a n'ime ngwa ahu

Akwụkwọ A Na-atụ Aro

Cambridge IGCSE Biology Coursebook
Cambridge IGCSE Biology Coursebook
Ìkọ̀wé-àbáojú: Fifth edition
Onye Mbipụta: Cambridge University Press
Afọ: 2021
ISBN: 978-1-108-74880-2
Akọkọ ọrọ.: Endorsed coursebook with full coverage of the 0610/0970 syllabus, practical investigations and exam-style questions.
Cambridge IGCSE Biology
Cambridge IGCSE Biology
Ìkọ̀wé-àbáojú: Fourth edition
Onye Mbipụta: Hodder Education
Afọ: 2021
ISBN: 978-1-5104-7864-0
Akọkọ ọrọ.: Endorsed textbook covering the Core and Supplement content with clear biological diagrams and questions.

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Meecha Ajụjụ Ule Ọmarịcha

Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Respiration (continued)? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.

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