At the onset of contraction, ATP is produced slowly by aerobic metabolism; what explains the subsequent rise in aerobic ATP production after about 60 seconds?

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Study for the Ivy Tech APHY 101 Muscle System Test. Dive into comprehensive questions with clear hints and explanations, boosting your confidence for the exam!

Multiple Choice

At the onset of contraction, ATP is produced slowly by aerobic metabolism; what explains the subsequent rise in aerobic ATP production after about 60 seconds?

As exercise continues, the body can supply more oxygen to the working muscles, allowing the mitochondria to maximize ATP production through oxidative phosphorylation. At the start of contraction, oxygen delivery lags behind demand, so ATP comes mainly from faster, non-oxidative sources. After about a minute, heart rate and breathing rate rise and blood flow to active muscles increases, so oxygen delivery catches up. With this ample oxygen, the oxidative system can meet energy needs, causing aerobic ATP production to rise. Increased lactic acid would reflect more anaerobic metabolism, not the shift to aerobic production, and a slower breathing rate would reduce oxygen delivery, not support the increase.

At the onset of contraction, ATP is produced slowly by aerobic metabolism; what explains the subsequent rise in aerobic ATP production after about 60 seconds?

Study for the Ivy Tech APHY 101 Muscle System Test. Dive into comprehensive questions with clear hints and explanations, boosting your confidence for the exam!

At the onset of contraction, ATP is produced slowly by aerobic metabolism; what explains the subsequent rise in aerobic ATP production after about 60 seconds?

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