Biology - 4BI1 PearsonEdexcel

Respiration

Gbogbo ọrọ náà

Every living cell needs a continuous supply of energy to drive processes like muscle contraction, protein synthesis, and cell division. That energy comes from respiration, a set of chemical reactions that release energy from glucose. Importantly, respiration is not the same as breathing: it happens inside cells, not inside lungs.

In this lesson you will compare aerobic and anaerobic pathways, learn the word and balanced symbol equations for each, and explore how ATP acts as the universal energy currency of the cell. These reactions underpin almost every other topic in biology, and Edexcel tests them as short-answer and extended-writing questions across both papers.

Ebumnobi

Understand how the process of respiration produces ATP in living organisms
Know that ATP provides energy for cells
Describe the differences between aerobic and anaerobic respiration
Know the word equation and the balanced chemical symbol equation for aerobic respiration in living organisms
Know the word equation for anaerobic respiration in plants and in animals
Investigate the evolution of carbon dioxide and heat from respiring seeds or other suitable living organisms

Akọmọ Ojú-ẹkọ

A sprinter explodes out of the starting blocks, muscles contracting hundreds of times per second. Every one of those contractions is powered by ATP molecules assembled inside the muscle cells just moments earlier. When the sprint lasts longer than about ten seconds, the cells start running short of oxygen and switch to a backup pathway that works without it. Understanding these two pathways explains why a 100 m sprint feels different from a marathon.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Respiration. 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.

Where does aerobic respiration mainly take place in a cell? A) Nucleus B) Cell membrane C) Cytoplasm D) Mitochondria Answer: D
What is the waste product of anaerobic respiration in yeast? A) Lactic acid B) Carbon dioxide only C) Ethanol and carbon dioxide D) Water and carbon dioxide Answer: C
Which of the following is NOT a use of energy from respiration? A) Muscle contraction B) Photosynthesis C) Active transport D) Protein synthesis Answer: B
How many more times ATP does aerobic respiration produce per glucose molecule compared with anaerobic? A) About 2 times B) About 5 times C) About 19 times D) About 100 times Answer: C
What causes the oxygen debt after vigorous exercise? A) The lungs need to recover from breathing fast B) Extra oxygen is needed to break down lactic acid C) Carbon dioxide must be removed from the blood D) The heart rate needs to return to normal Answer: B