The aim of this experiment is to investigate the effect exercise has on the pulse rate. The pulse rate is defined as 'The rhythmical throbbing of arteries produced by the regular contractions of the heart'.

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The aim of this experiment is to investigate the effect exercise has on the pulse rate. The pulse rate is defined as 'The rhythmical throbbing of arteries produced by the regular contractions of the heart'.

I will attempt to conduct my investigation in a safe manner by having an adult and a first aid kit nearby in case of any accidents. In addition the experiment shall be performed in an open space to avoid damage to other equipment or myself. Suitable clothing shall be worn to prevent hazards from occurring.

I predict that the pulse rate during exercise will increase. This is because during exercise the muscles of the body are contracting faster and therefore need more oxygen to be satisfied. This will increase the pulse rate, as the heart will have to pump more blood at larger volumes at a faster rate. As a result there would be an increase in the amount of carbon dioxide (CO2) produced because it is a bi-product of respiration.

SCIENTIFIC KNOWLEDGE:

The equation for aerobic respiration is:

C2H12O6 + 6O2 6CO2 + 6H2O + Energy

Glucose + Oxygen Carbon Dioxide + Water + Energy

Respiration is the process of converting glucose to energy with the presence of oxygen, which goes on in every cell. The oxidation of the glucose releases energy because the reactants (glucose and oxygen) are less stable as atoms than as products (carbon dioxide and water).
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When the body is in oxygen debt, it uses a process known as anaerobic respiration. Anaerobic respiration is the process by which energy is derived from the break down of glucose (a type of sugar) with the absence of oxygen. The body uses anaerobic respiration when oxygen cannot be delivered to contracting muscles fast enough to meet their needs.

C6H12O6 2CH3CH(OH) COOH +Energy

As the break down of glucose is incomplete in anaerobic respiration, less energy is released than when sugar is broken down in aerobic conditions.

In anaerobic respiration a considerable amount of energy ...

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