The sliding filament model is our best explanation of how a skeletal muscle shortens. based on your knowledge of the structure of the sarcomere and the changes that occur in the sarcomere with muscle contraction, explain the evidence that supports the sliding filament model.

A sacromere is a segment between two adjacent Z discs and are essential for the striated structure of the cardiac and skeletal muscles.

Explanation:

The Z disc is surrounded by the I band made of thin filament called actin. The I band is followed by the A band made up of thick filament called myosin. When the muscles contract the actin and the myosin become superimposed/overlapped.

The sliding filament model explains the contraction of the sacromere in which the Z discs move closer due to the overlapping of the thin and thick filaments. Thus the I band moves close to the A band which remain the same length as shown in figure.

The answer is a because - is an direction

Writing, you can revisit previous parts of the lesson by returning to the course map. be sure to refer to the lab’s student guide, which you can find on the first page of the lab experiment activity