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During exercise you breathe more quickly, your heart beats faster and your pulse rate increases.

Respiration 02

Respiration is how cells release energy. In KS3 Science, students learn about aerobic respiration, which uses oxygen, and anaerobic respiration, which happens without oxygen.

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Fascinating Fact:

Aerobic respiration needs oxygen and produces carbon dioxide, water, and lots of energy.

In KS3 Science, pupils explore how respiration provides energy for living things. Aerobic respiration uses oxygen to break down glucose completely, releasing more energy than anaerobic respiration.

Key Terms

Glucose: A simple sugar that acts as the main fuel for respiration.
Aerobic Respiration: A type of respiration that requires oxygen and releases lots of energy.
Carbon Dioxide: A gas produced as a waste product during aerobic respiration.

Frequently Asked Questions (Click to see answers)

What are the products of aerobic respiration?

Aerobic respiration produces carbon dioxide, water, and a large amount of energy, which is used by cells for growth, repair, and movement.

Why is oxygen important in aerobic respiration?

Oxygen is needed to fully break down glucose in aerobic respiration. This releases more energy than anaerobic respiration, which happens without oxygen.

How is aerobic respiration different from anaerobic respiration?

Aerobic respiration uses oxygen and makes lots of energy. Anaerobic respiration happens without oxygen, produces less energy, and can cause lactic acid buildup.

Try These Related Quizzes

1 .

When we exhale which one of the following is NOT correct?

The volume of the thorax decreases

The air is forced out of the lungs

The diaphragm relaxes

The rib muscles contract

The rib muscles are called intercostal muscles and they relax when you breathe out

2 .

Which of the following is NOT true about the effect of exercise?

Breathe more quickly

Heart beats faster

Less oxygen and glucose get to the muscles

Pulse rate increases

The increased flow of blood and increased rate of inhalation means that there is a greater supply of oxygen and glucose to cells. This allows for a greater rate of cellular respiration in the muscle cells

3 .

Which two substances are needed for aerobic cellular respiration to take place?

Glucose and carbon dioxide

Glucose and water

Oxygen and glucose

Oxygen and water

Aerobic respiration occurs in animal and plant cells, releasing energy for the cell to use

4 .

Cellular respiration occurs in .......

only cells in the arms and legs

only heart cells

only muscle cells

all cells

OK, all cells isn't quite true. Cellular respiration doesn't take place in hair, nails and claws for example, because their cells are not living

5 .

Which of the following are the products of cellular respiration?

Energy, carbon dioxide and water

Energy, glucose and carbon dioxide

Energy, oxygen and glucose

Energy, oxygen and water

The energy released by cellular respiration is required to keep the cells alive

6 .

The diaphragm is .......

a lining of the lungs

a muscle which connects the ribs

a sheet of muscle under the lungs

the windpipe

As this moves downwards, it increases the volume of the chest cavity

7 .

Oxygen is transported to all parts of the body by .......

blood plasma

dissolving in water

red blood cells

white blood cells

Red blood cells have no nucleus

8 .

The trachea (windpipe) is kept open because it is contains rings made from .......

bone

capillaries

cartilage

muscle

Cartilage is a flexible material that keeps its shape. It is found in various places of your body e.g. joints and your nose

9 .

Which of the following statements is FALSE?

Carbon dioxide diffuses into blood plasma from cells.

Carbon dioxide diffuses into the alveoli from the blood.

Carbon dioxide dissolves in white blood cells.

Carbon dioxide is transported in the bloodstream to the lungs.

Carbon dioxide is produced during cellular respiration. It is a waste product and therefore needs to be removed from living cells as efficiently as possible. White blood cells do not transport gases, they are present in the body as a defence system

10 .

When we inhale which one of the following is NOT correct?

More space is formed in the thorax (volume increases)

The air pressure in the chest (thorax) increases

The diaphragm contracts

The rib muscles contract

The air pressure in the chest (thorax) decreases

You can find more about this topic by visiting BBC Bitesize - Respiration

Author: Sue Davison (Chemistry Specialist & KS3 Science Teacher, Quiz Writer)