Image Based Question – 74220

In the following electron micrograph of the sarcomere correctly identify the area labeled as “E”?

A. A-band

B. I-band

C. M-band

D. H-zone

Correct Answer » B Explanation

Ans: B. I-band

• Area marked, as ‘E’ is lighter & isotropic band = I-band.
• Contains.
• Dark Z-line at its center.
• Light I band divided by dark Z line & dark A band.
• Has lighter H band in its center.
• M line – Transverse line seen in middle of H hand.
• Sarcomere – Area between two adjacent Z lines.

• (A: A-band ; B: Actin filaments; C: Sarcomere width; D: H-zone).