Question

Which of these is found at the two ends of a sarcomere?

(a) ‘H’ line

(b) ‘A’ line

(c) ‘M’ line

(d) ‘Z’ line

This question was posed to me in semester exam.

My doubt stems from Locomotion & Movement topic in division Locomotion and Movement of Biology – Class 11

Answer 1

The correct choice is (d) ‘Z’ line

Easiest explanation: The two ends of a sarcomere or a contractile unit of a muscle is marked by the presence of ‘Z’ lines. It contains one whole ‘A’ band or anisotropic band and half of an ‘I’ band or isotropic band.