Question

The Z disc is the: Group of answer choices separation between sarcomeres. electrical voltage at which a muscle cell fires an action potential. area of a sarcomere where only thick myofilaments are found. point where the axon and the sarcolemma meet. place where two cardiac muscle cells meet.

Answer 1

Answer:

Separation between sarcomeres.

Explanation:

The structure of the muscle fibre is composed of many functional units called sarcomere which is interrupted by the discs called Z-discs.

These Z-discs are made of the alpha-actin homodimers which allow the actin filament allows to bind to it along with other proteins.  The Z-discs since present at regular intervals in a muscle appears to separate the sarcomere and defines the boundaries of the sarcomere.

Thus, the selected option is correct.