12.2

Aerobic respiration

Cambridge IGCSE Biology (0610)  · Unit 12: Respiration  · 11 flashcards

Aerobic respiration is topic 12.2 in the Cambridge IGCSE Biology (0610) syllabus , positioned in Unit 12 — Respiration , alongside Respiration and Anaerobic respiration.  In one line: Aerobic respiration is the chemical process occurring within cells that utilizes oxygen to break down nutrient molecules, such as glucose, to release energy for cellular functions.

This topic is examined in Paper 1 (multiple-choice) and Papers 3/4 (theory), plus Paper 5 or Paper 6 (practical / alternative to practical).

The deck below contains 11 flashcards — 1 definition, 6 key concepts, 2 process cards, 1 application card and 1 identification card — covering the precise wording mark schemes reward.  Use the definition card to lock down command-word answers (define, state), then move on to the concept and application cards to handle explain, describe and compare questions.

Key definition

Aerobic respiration

Aerobic respiration is the chemical process occurring within cells that utilizes oxygen to break down nutrient molecules, such as glucose, to release energy for cellular functions.

Example: muscle cells respire aerobically during exercise.

What the Cambridge 0610 syllabus says

Official 2026-2028 spec

These are the exact learning objectives Cambridge sets for this topic. Match the command word (Describe, Explain, State, etc.) in your answer to score full marks.

  1. Describe Describe aerobic respiration as the chemical reactions in cells that use oxygen to break down nutrient molecules to release energy
  2. State State the word equation for aerobic respiration as: glucose + oxygen → carbon dioxide + water
  3. State State the balanced chemical equation for aerobic respiration as: C6H12O6 + 6O2 → 6CO2 + 6H2O Supplement
Definition Flip

Define aerobic respiration.

Answer Flip

Aerobic respiration is the chemical process occurring within cells that utilizes oxygen to break down nutrient molecules, such as glucose, to release energy for cellular functions.

Example: muscle cells respire aerobically during exercise.
Key Concept Flip

Write the word equation for aerobic respiration.

Answer Flip

Glucose + Oxygen → Carbon Dioxide + Water. This process occurs in the mitochondria of cells, like in the cells of the heart muscle.

Key Concept Flip

Write the balanced chemical equation for aerobic respiration.

Answer Flip

C6H12O6 + 6O2 → 6CO2 + 6H2O. This equation represents the breakdown of one glucose molecule in the presence of oxygen, yielding carbon dioxide and water, releasing energy. This occurs in human cells when oxygen is inhaled during breathing.

Key Concept Flip

What is the role of oxygen in aerobic respiration?

Answer Flip

Oxygen acts as the final electron acceptor in the electron transport chain during aerobic respiration. Without oxygen, the process halts, and cells must rely on less efficient anaerobic respiration; for instance, during intense exercise in muscle cells.

Key Concept Flip

What type of energy is released during aerobic respiration?

Answer Flip

Chemical energy stored in glucose molecules is converted into a usable form of energy called ATP (adenosine triphosphate) during aerobic respiration. This ATP is then utilized to power various cellular activities, such as muscle contraction.

Key Concept Flip

Where does aerobic respiration occur within a cell?

Answer Flip

Aerobic respiration primarily takes place in the mitochondria of eukaryotic cells. The reactions of the electron transport chain occur on the inner mitochondrial membrane.

Example: Liver cells have a high number of mitochondria.
Key Concept Flip

Name two products of aerobic respiration.

Answer Flip

Carbon dioxide (CO2) and water (H2O) are the two main products of aerobic respiration. Carbon dioxide is excreted from the lungs, and water is either used by the body or excreted through urine or sweat.

Example: Exhaling CO2.
Key Concept Flip

How is aerobic respiration important for organisms?

Answer Flip

Aerobic respiration provides organisms with the energy required to perform essential life processes, such as growth, movement, and maintaining homeostasis. Animals and plants rely on aerobic respiration to fuel their activities.

Example: a cheetah running.
Key Concept Flip

What happens to the rate of aerobic respiration during exercise?

Answer Flip

The rate of aerobic respiration increases during exercise to meet the increased energy demands of the muscles. This results in a higher consumption of oxygen and production of carbon dioxide.

Example: breathing rate and heart rate increase.
Key Concept Flip

How does temperature affect the rate of aerobic respiration?

Answer Flip

Enzymes involved in aerobic respiration function optimally within a certain temperature range. As temperature increases (up to a point), the rate of respiration generally increases. Above this optimum temperature, enzymes denature, and the rate decreases.

Example: Plant respiration.
Key Concept Flip

How is glucose transported to cells for aerobic respiration?

Answer Flip

Glucose is transported to cells via the bloodstream after being absorbed from the small intestine. Insulin facilitates the uptake of glucose into cells, where it is used in aerobic respiration, or stored as glycogen.

Example: Blood glucose regulation.

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12.1 Respiration 12.3 Anaerobic respiration

Key Questions: Aerobic respiration

Define aerobic respiration.

Aerobic respiration is the chemical process occurring within cells that utilizes oxygen to break down nutrient molecules, such as glucose, to release energy for cellular functions.

Example: muscle cells respire aerobically during exercise.

More topics in Unit 12 — Respiration

Aerobic respiration sits alongside these Biology decks in the same syllabus unit. Each uses the same spaced-repetition system, so progress in one informs the next.

12.1 Respiration

16 flashcards
12.3 Anaerobic respiration

10 flashcards

Key terms covered in this Aerobic respiration deck

Every term below is defined in the flashcards above. Use the list as a quick recall test before your exam — if you can't define one of these in your own words, flip back to that card.

Aerobic respiration

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How to study this Aerobic respiration deck

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