The skeletal muscle sarcomere normally has a narrow range of lengths in vivo, but sarcomere length can vary greatly in vitro under nonphysiological conditions. The diagram shows sarcomeres at various lengths. At which length can the sarcomere exert its maximum force during an isometric contraction?

A. $1.6 \mu \mathrm { m }$
B. $2.1 \mu \mathrm { m }$
C. $2.8 \mu \mathrm { m }$
D. $3.0 \mu \mathrm { m }$
E. $3.5 \mu \mathrm { m }$

Question

The skeletal muscle sarcomere normally has a narrow range of lengths in vivo, but sarcomere length can vary greatly in vitro under nonphysiological conditions. The diagram shows sarcomeres at various lengths. At which length can the sarcomere exert its maximum force during an isometric contraction?

A. $1.6 \mu \mathrm { m }$
B. $2.1 \mu \mathrm { m }$
C. $2.8 \mu \mathrm { m }$
D. $3.0 \mu \mathrm { m }$
E. $3.5 \mu \mathrm { m }$

Quizplus · Accepted Answer

The Answer is B

The Skeletal Muscle Sarcomere Normally Has a Narrow Range of Lengths