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Biology · Grades 7–10

Cellular respiration and breathing

Distinguish chemical energy release from gas movement.

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Learn the idea

Respiration

Cellular respiration transfers energy from fuel molecules to usable cellular forms such as ATP.

Breathing

Breathing moves air; it supports gas exchange but is not identical to respiration.

Aerobic

Aerobic respiration uses oxygen as the final electron acceptor in the standard model.

Organisms

Plants, animals and many microorganisms respire; pathways differ across conditions and organisms.

Worked examples

Is breathing identical to cellular respiration?

Breathing is air movement; respiration is a cellular chemical process.

No.

Which molecule commonly transfers usable energy within cells?

ATP participates in energy coupling.

ATP.

Check your understanding

  1. Do plant cells perform respiration?

    1. Yes.
    2. Only after the plant becomes nonliving.
    3. No, photosynthesis replaces every cellular energy process.

  2. In a simplified equation, one glucose yields 6 CO₂. How many CO₂ molecules correspond to 3 glucose molecules?

  3. Why should energy not be described as an atom produced by respiration?

Answers and marking notes

Answers and marking notes
  1. Yes.

    Plants use cellular respiration.

  2. 18

    3 × 6 = 18 in the stated model.

  3. Energy transfer is not the creation of a new kind of atom.

    Matter and energy accounting are different descriptions.

Further reading and review references

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Independent educational review required. Grade bands are approximate; these are not officially aligned curricula.