A Level Biology Practice Exam

What is a potential consequence of low oxygen uptake in the lungs?

1. Improved athletic performance

2. Development of lactic acid in muscles

3. Increased energy production

4. Enhanced cognitive function

The correct answer is: Development of lactic acid in muscles

Low oxygen uptake in the lungs can lead to an insufficient supply of oxygen to the body's tissues. When the muscles do not receive enough oxygen, they resort to anaerobic respiration for energy production. This process generates lactic acid as a byproduct, which can accumulate in the muscles, leading to muscle fatigue and decreased performance. Understanding this physiological response helps clarify the significance of maintaining adequate oxygen levels, especially during activities that demand high energy output. In contrast, improved athletic performance, increased energy production, and enhanced cognitive function would typically rely on adequate oxygen availability, making them unlikely consequences of low oxygen uptake.