Introduction to the Muscular System

A skeletal muscle consists of bundles of ____, which are each wrapped in their own connective sheath.

• sarcomeres
• fascicles
• myofibrils
• tendons

Tendons connect muscle to bone.

• True
• False

The cell membrane of a muscle cell is called the 

• sarcomere
• sarcolemma
• perimysium
• thin filament

The basic functional unit of a muscle fiber is the 

• sarcolemma
• sarcomere
• aponeurosis
• myofibril

Which of the following bands is not found within a sarcomere?

• A
• I 
• H
• B

The thin filament protein of a myofibril is the 

• actin
• myosin

The connection between the thin filaments and the thick filaments is called a cross-bridge.

• True
• False

During a muscle contraction, the thick filaments move slowly past the thin filaments of the myofibril.

• True
• False

Each sarcomere is found between the 

• A lines
• Z lines
• H lines
• I lines

When a muscle contracts, it shortens along with the sarcomere.

• True
• False