Compared to resting muscle cells, actively contracting muscle tissue has:

Question

BlackTom AI · Accepted Answer

The prompt asks us to compare resting muscle cells with actively contracting muscle tissue and to evaluate the provided answer choice.
Since no alternative answer options are listed, we can only analyze the single given option in context.
Option provided: 'A higher rate of NAD+/NADH turnover.'
When muscle contracts, its energy demand skyrockets. To meet ATP needs, pathways such as glycolysis, the citric acid cycle, and oxidative phosphorylation ramp up their activity. These pathways involve frequent redox reactions that convert NAD+ to NADH and back, increasing the turnover of the NAD+/NADH pool. Consequently, a higher rate of NAD+/NADH cycling is expected in actively contracting muscle compared to resting muscle.
Additional context for why this makes sense: during contraction, ATP is consumed rapidly (ATP → ADP + Pi), triggering energy-sensing mechanisms that upregulate glycolysis and oxidative phosphorylation. This upregulation shortens the NADH/NAD+ cycling time, as NADH is oxidized back to NAD+ in the electron transport chain, supporting sustained ATP production. Therefore, the statement aligns with known bioenergetics of exercising muscle.
However, because no other answer choices are provided, we cannot assess or contrast the correctness of alternative statements. The evaluation here is limited to the validity of the single option given, which is consistent with the biochemical demands of active muscle tissue.

2025_S1C_BCMB2001/BCMB2901/MEDS2003 Metabolism Quiz (5%)

Compared to resting muscle cells, actively contracting muscle tissue has:

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2025_S1C_BCMB2001/BCMB2901/MEDS2003 Metabolism Quiz (5%)

Compared to resting muscle cells, actively contracting muscle tissue has:

View Explanation

Log in for full answers

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Question at position 93 The final electron acceptor in aerobic cellular respiration is:FADH2NADHO2CO2

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