Factors affecting aerobic respiration

The factors that affect the rate of aerobic respiration are:

  • temperature,
  • glucose concentration,
  • oxygen concentration.

A graphic depicting the factors affecting aerobic respiration. The graphic is divided into 2 sets of images, with one set above the other. The set of images at the top of the graphic include, on the far left side, a stylised image of two thermometers labeled temperature. One thermometer has an image of a sun on it and is coloured to represent heat, and the other thermometer has an image of a snowflake and is coloured to represent cold. To the right of the thermometers is an image of a sugar cube labeled glucose. To the right of the sugar cube is an image of stylised clouds with the label oxygen. Two arrows point downwards from the image of glucose to the set of images in the lower half of the graphic. The first arrow points to the image on the far left of the lower set of images. This image is kidney shaped and labeled mitochondria. The second arrow points to an image of an equation and the stylised image of a person running.

These factors can either positively or negatively impact the rate of aerobic respiration. These factors can be plotted on graphs and their effects visually depicted as to how they affect the rate of aerobic respiration.

Use this page to revise the following concepts within factors affecting aerobic respiration:

Effect of temperature

Temperature influences the rate of enzymatic reactions involved in aerobic respiration.

Enzymes, such as those involved in glycolysis, the Krebs cycle, and the electron transport chain work most efficiently at an optimal temperature range.

In low temperatures enzymatic activity will slow down, thus reducing the rate of aerobic respiration.

In high temperatures enzymes can become denatured, thus impairing their function and stopping the process of aerobic respiration.

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Effect of glucose availability

Glucose is the primary fuel for aerobic respiration.

The rate of aerobic respiration increases with the availability of glucose, as it is the starting point for glycolysis .

If glucose levels are low, cells may rely on alternative energy sources such as fatty acids or amino acids , but these processes may yield less ATP or be less efficient.

To determine this effect, carbon dioxide volume was measured (as carbon dioxide is an output of aerobic respiration) in relation to the concentration of glucose that yeast cells were living in.

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Effect of oxygen concentration

Aerobic respiration requires oxygen to fully oxidise glucose into carbon dioxide and water, producing a large amount of ATP.

If oxygen is limited (e.g., in anaerobic conditions), cells shift to anaerobic respiration or fermentation, which generates less ATP.

Low oxygen levels can also cause a buildup of lactate (in animals) or ethanol and CO₂ (in yeast), limiting the efficiency of ATP production.

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