Certified Transport Registered Nurse Certification Practice Exam

Which statement is true regarding the effects of increased respiratory rate on the body?

1. Decreases blood pH

2. Increases blood oxygenation

3. Decreases CO2 retention

4. Does not affect heart rate

The correct answer is: Increases blood oxygenation

Increased respiratory rates primarily serve to enhance the body's ability to exchange gases effectively. When the respiratory rate rises, the body can take in more oxygen and expel carbon dioxide more rapidly. This process can lead to increased blood oxygenation as fresh oxygen enters the alveoli in the lungs. An elevated rate of breathing allows for greater ventilation, which is crucial in maintaining adequate levels of oxygen in the bloodstream, especially during times of increased physical activity or respiratory distress. Throughout this process, the regulation of blood gases is tightly linked to respiratory function. While increased respiratory rates can positively impact blood oxygen levels, they can also lead to changes in carbon dioxide levels. Thus, understanding these interactions is essential for maintaining homeostasis and ensuring that the body's cells receive the oxygen they need for efficient metabolic processes.