객관식
Your maximum oxygen intake is a measurement of the ability __________.
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8. Respiration
Introduction to Aerobic Cellular Respiration
객관식
Oxygen concentration in the air is considered deficient if it drops below which of the following percentages?
A
23.5\%
B
21\%
C
16\%
D
19.5\%
검증된 단계별 안내1
Step 1: Understand the context of the problem. Oxygen concentration in the air is critical for human survival, and a deficiency occurs when the percentage drops below a certain threshold. This is important for biological processes like cellular respiration.
Step 2: Recall the normal oxygen concentration in the atmosphere. Earth's atmosphere typically contains approximately 21% oxygen, which is sufficient for most biological functions.
Step 3: Identify the threshold for oxygen deficiency. Oxygen levels below 19.5% are considered deficient because they can impair human health and biological functions, such as reduced oxygen delivery to tissues.
Step 4: Compare the given percentages (23.5%, 21%, 16%) to the threshold value (19.5%). Note that 23.5% and 21% are above the threshold, while 16% is below it.
Step 5: Conclude that the correct answer is 19.5%, as it represents the threshold below which oxygen concentration is considered deficient.
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