SACE Stage 2 Physical Education Practice Questions - SACE Stage 2 Physical Education Assessment Exam

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What immediate cardiovascular response occurs at the onset of submaximal exercise to meet increased muscular oxygen demand?

Heart rate decreases to conserve cardiac blood volume. Heart rate increases rapidly due to parasympathetic withdrawal and sympathetic stimulation. Stroke volume drops to zero during the initial contraction phase. Arteriovenous oxygen difference narrows completely as oxygen extraction stops.

Correct Answer:

Heart rate increases rapidly due to parasympathetic withdrawal and sympathetic stimulation.

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