OAR Mechanical Comprehension Practice Test 2025 – Complete Exam Prep

Question: 1 / 400

How does lower air density at high altitudes affect breathing?

It makes breathing easier

It has no effect

It can cause difficulty breathing

At high altitudes, the air density decreases, which results in a lower concentration of oxygen available for breathing. Oxygen is essential for human respiration; therefore, when individuals ascend to higher altitudes, the reduced air density means that each breath contains fewer oxygen molecules. This can lead to difficulty in obtaining sufficient oxygen, particularly during physical exertion or for those not acclimatized to the altitude. The body may struggle to meet its oxygen demand, causing symptoms such as shortness of breath, increased heart rate, and fatigue.

While the concept of air density impacting respiration is key to understanding the effects of high altitude, other choices like the assertion that breathing becomes easier or has no effect neglect the physiological realities of how oxygen levels change with elevation. Additionally, stating that it only affects swimmers is irrelevant, as the phenomenon is applicable to all individuals exposed to high-altitude environments, regardless of their activities.

Get further explanation with Examzify DeepDiveBeta

It only affects swimmers

Next Question

Report this question

Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy