In the aerobic energy system, which stage begins in the sarcoplasm and is anaerobic?

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Prepare for the AQA A-Level PE Energy Systems Exam. Study with comprehensive flashcards and multiple-choice questions, featuring hints and explanations. Ace your exam with confidence!

Multiple Choice

In the aerobic energy system, which stage begins in the sarcoplasm and is anaerobic?

Explanation:
Glycolysis is the stage that starts in the sarcoplasm (the cytoplasm of a muscle cell) and operates without oxygen. In this pathway, glucose is split into two pyruvate molecules, yielding a small amount of energy—net about 2 ATP—and reducing NAD+ to NADH. Because it doesn’t require oxygen, glycolysis is the anaerobic part of the aerobic energy system. If oxygen is present, the pyruvate moves into the mitochondria to be further oxidized via the Krebs cycle and the electron transport chain, producing most of the ATP. If oxygen isn’t available, pyruvate can be converted to lactate to keep glycolysis going.

Glycolysis is the stage that starts in the sarcoplasm (the cytoplasm of a muscle cell) and operates without oxygen. In this pathway, glucose is split into two pyruvate molecules, yielding a small amount of energy—net about 2 ATP—and reducing NAD+ to NADH. Because it doesn’t require oxygen, glycolysis is the anaerobic part of the aerobic energy system. If oxygen is present, the pyruvate moves into the mitochondria to be further oxidized via the Krebs cycle and the electron transport chain, producing most of the ATP. If oxygen isn’t available, pyruvate can be converted to lactate to keep glycolysis going.

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