Live Quiz Arena
🎁 1 Free Round Daily
⚡ Enter ArenaQuestion
← Human Body & HealthWhy does an elderly individual's muscle tissue exhibit reduced force generation compared to a younger person, even when stimulated with the same electrical signal?
A)Increased mitochondrial oxidative phosphorylation efficiency
B)Enhanced acetylcholine receptor sensitivity at synapses
C)Decreased excitation-contraction coupling efficiency due to aging✓
D)Elevated calcium reuptake rate into sarcoplasmic reticulum
💡 Explanation
Reduced force generation in elderly muscle tissue results from decreased excitation-contraction coupling efficiency because this mechanism is impaired during aging, leading to reduced calcium release and actin-myosin interaction. Therefore, force generation is diminished, rather than being caused by improved mitochondrial function or enhanced receptor sensitivity.
🏆 Up to £1,000 monthly prize pool
Ready for the live challenge? Join the next global round now.
*Terms apply. Skill-based competition.
Related Questions
Browse Human Body & Health →- Why does blood's oxygen saturation decrease more dramatically in a fetus than in a mother when pH levels drop due to increased lactic acid production during strenuous activity?
- A patient exhibits chronic fatigue and pale skin after gastric bypass surgery. Which mechanism explains why these symptoms occur despite adequate dietary iron intake and supplemental vitamin B12?
- Why does core body temperature initially rise during heatstroke, despite compensatory mechanisms like sweating and vasodilation?
- Why does a drug that blocks reuptake transporters in a synapse often prolong the effect of a neurotransmitter, rather than simply increasing its concentration?
- A patient consistently feels hungry shortly after consuming a carbohydrate-rich meal. Which mechanism explains why this individual experiences early satiety failure?
- If a burn wound disrupts keratinocyte migration due to compromised fibronectin matrix deposition in the extracellular matrix, which consequence follows, assuming the wound remains sterile?
