Which pairing of a sarcomere structure with its corresponding description is correct?
A) H zone: appears light on an electron micrograph; found where actin and myosin filaments overlap when muscle is relaxed
B) Z line: where myosin is anchored in the center of the H zone
C) M band: dark stripe within the H zone whose proteins hold actin in a regular arrangement
D) A band: region containing only myosin filaments when the muscle is contracted
E) I band: appears light on an electron micrograph; found where actin and myosin filaments do not overlap

Question

Quizplus · Accepted Answer

The I band appears light on an electron micrograph because it consists of areas where actin and myosin filaments do not overlap, containing only the thinner actin filaments. This area becomes narrower during muscle contraction as the actin and myosin filaments slide past each other.

Which Pairing of a Sarcomere Structure with Its Corresponding Description