Question

With the help of a neat labelled diagram, describe the location, structure and function of striated muscle fibre.

Answer 1

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Answer 2

The muscles that attach to, and move, the skeleton are called skeletal muscles.

A skeletal muscle is composed of cells called muscle fibers.

Muscle fibers run in parallel along the entire length of the muscle.

Each muscle fiber consists of a bundle of myofibrils.

The cell membrane of a muscle fiber is called the sarcolemma.

The cytoplasm is called the sarcoplasm.

Muscle fibers have multiple nuclei and numerous mitochondria


A myofibril is made up of units called sarcomeres.

Sarcomeres line up end-to-end along the length of a myofibril.
A sarcomere is contained within two Z lines.

A sarcomere contains many protein filaments, in a parallel array.
Some filaments are thin (actin), and the others are thick (myosin).


Actin is a globular protein that forms two beaded strands, twisted together.

Actin filaments also have the proteins, tropomyosin and troponin.

Tropomyosin is a long thin molecule that wraps around the actin filament.

Troponin is a globular protein situated at regular intervals along the tropomyosin.


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The skeletal musculature is part of the locomotor system and has the task of moving and stabilizing the skeleton. Therefore they are attached to the bones by collagen-rich tendons. But also other organs such as the tongue, mimic musculature and the diaphragm consist of skeletal musculature