In the sarcomere length--tension relationship curve, at which point is the maximum active tension generated due to optimal overlap between actin and myosin filaments?
Show Hint
Maximum active tension occurs at optimal actin-myosin overlap; excessive shortening or stretching reduces force.
Concept:
Maximum active tension in skeletal muscle occurs at the optimal sarcomere length, where actin and myosin overlap is ideal for maximum cross-bridge formation.
Step 1: Understand active tension.
Active tension depends on the number of actin-myosin cross-bridges formed during contraction.
Step 2: Identify optimal overlap.
Maximum active tension occurs when actin and myosin have optimal overlap, not too much and not too little.
Step 3: Match with the graph point.
In the length--tension curve, the point representing optimal overlap and maximum active tension is:
\[
\text{Point B}
\]
Therefore, the correct answer is Point B.
