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Aerobic respiration: releasing energy from glucose

Science · Organisms & Life Processes · ages 12-13

Name ______________________ Date ____________

In a human muscle cell, where does aerobic respiration start, and where do most stages take place?
- Starts in mitochondria; most stages in cytoplasm
- Starts in mitochondria; most stages happen there
- Starts in cytoplasm; most stages in mitochondria
What are the products of aerobic respiration?
- Glucose and carbon dioxide
- Carbon dioxide and water
- Oxygen and water
Breathing and respiration mean exactly the same thing.
Circle one: True False
During PE, why does your heart beat faster?
- To pump oxygen and glucose to muscle cells faster
- To force air into lungs in place of the diaphragm
- To stop the muscles from producing carbon dioxide
A pupil adds energy to the list of substances after the arrow in an aerobic respiration word equation. Which change should they make?
- List energy as another substance made.
- Describe the energy release beside the word equation.
- Remove any mention of energy because the reactions do not release it.
The bars show a pupil's breathing rate in breaths per minute. How much higher is the rate after PE than at rest?
Answer: ______________
A runner breathes faster while her muscle cells carry out aerobic respiration. Which statement explains how these processes work together?
- Breathing breaks down glucose in the lungs; blood then carries all the released energy to muscle cells.
- Breathing brings in oxygen; blood carries it to muscle cells that release energy from glucose.
- Breathing stops reactions in muscle cells; blood carries energy made by incoming air to the muscles.
Amir says, 'When I run, my muscle cells make oxygen through aerobic respiration.' Which correction should Amir make?
- Working muscles do not need oxygen carried in the blood
- Only the cells in the lungs respire while a person is running
- Respiration uses oxygen; it does not make oxygen

Answer key

For grown-ups. Fold this page away before handing over the rest.

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Starts in cytoplasm; most stages in mitochondria · Aerobic respiration starts in the cytoplasm. Most stages take place in mitochondria, so neither location alone describes the whole process.
Carbon dioxide and water · Carbon dioxide and water are produced. Glucose and oxygen are reactants used in aerobic respiration.
False · Breathing moves air in and out of the lungs. Respiration releases energy through chemical reactions in cells.
To pump oxygen and glucose to muscle cells faster · Working muscles need more energy. Faster blood flow delivers oxygen and glucose for aerobic respiration and carries carbon dioxide away.
Describe the energy release beside the word equation. · Aerobic respiration releases energy, but energy is not a substance. Describe its release beside the word equation instead of listing it as another substance made.
20 · Subtract the resting rate from the rate after PE: 35 - 15 = 20 more breaths per minute.
Breathing brings in oxygen; blood carries it to muscle cells that release energy from glucose. · Breathing supplies air. Oxygen crosses into blood and reaches muscle cells, where aerobic respiration releases energy from glucose.
Respiration uses oxygen; it does not make oxygen · Oxygen is a reactant in aerobic respiration. It is used, while carbon dioxide and water are produced.