NEUROLOGY
MOTOR NEURONE DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An increase in carbon dioxide concentration of the blood.
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An increase in pH of the blood.
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An increase in impulses received by the sinoatrial node.
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An increase in heart rate.
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Detailed explanation-1: -Vigorous exercise will lower blood pH, thus making blood more acidic. This occurs because muscle cells are forced to perform anaerobic respiration during vigorous exercise. A product of this form of cellular respiration is lactic acid. The presence of this acid will lower the pH of the blood.
Detailed explanation-2: -The development of acidosis during intense exercise has traditionally been explained by the increased production of lactic acid, causing the release of a proton and the formation of the acid salt sodium lactate.
Detailed explanation-3: -In skeletal muscle, activation of sympathetic nerves results in vasoconstriction. In contrast, increasing the metabolic activity of muscle fibers induces vasodilation. Arteriolar diameter also reflects changes in transmural pressure and luminal blood flow.