Which describes the short-term effect of increased muscle temperature during exercise?

Which describes the short-term effect of increased muscle temperature during exercise?

• A. Increased muscle temperature
• B. Lactic acid buildup
• C. Contraction, lengthening, and relaxing at increased rate
• D. More carbon dioxide produced

Answer: (A)

When you start exercising, your muscles heat up quickly. The immediate, short-term change you can observe is an increase in muscle temperature. That warmth is important because it speeds up chemical reactions in the muscle and improves nerve transmission, which helps muscles contract and relax more rapidly. Lactic acid buildup and more CO2 are metabolic byproducts of activity, not the direct immediate effect of the temperature rise itself, whereas the faster contraction and relaxation are downstream effects that occur because the muscles are warmer.

When you start exercising, your muscles heat up quickly. The immediate, short-term change you can observe is an increase in muscle temperature. That warmth is important because it speeds up chemical reactions in the muscle and improves nerve transmission, which helps muscles contract and relax more rapidly. Lactic acid buildup and more CO2 are metabolic byproducts of activity, not the direct immediate effect of the temperature rise itself, whereas the faster contraction and relaxation are downstream effects that occur because the muscles are warmer.