Muscle Cell and Sliding Filament Theory

What are the 3 types of muscles?

• Skeletal, muscular, ligament
• Skeletal, smooth, cardiac
• Smooth, Cellular, Cerebrum
• Cardiac, smooth, brain stem

What is labeled "4" (the blue/purple part) in the diagram?

• sarcolemma

• sarcoplasmic reticulum

• transverse tubules

• myofibril

Name the following in order from largest to smallest:

• muscle, muscle fascicle, muscle cell, myofibril, filaments

• muscle, muscle fascicle, muscle cell, filaments, myofibril

• muscle, muscle cell, muscle fascicle, myofibril, filaments

• muscle, muscle cell, muscle fascicle, filaments, myofibril

____________ attaches to actin to form the cross bridge.

• Troponin

• Tropomyosin

• Myosin

• Calcium

The entire muscle is encased by connective tissue called the

• sacromere

• sarcoplasm

• myosin

• epimysium

The _______________ covers bundles of cells (fascicles) within the muscle.

• endomysium

• perimysium

• sarcoplasm

• tendon

Structure B is known as the thin filaments of the sarcomere, what is another name for the thin filaments?

• myosin

• actin

• fascia

• myofibril

Structure C is known as the thick filament of the sarcomere, it is also known as

• myosin

• actin

• fascia

• myofibrils

The unit between A and A is called

• a sarcomere

• The I band

• the Z disc

• fascia

What is a crossbridge?

• Where myosin binds to actin

• Where the calcium crosses into the cytoplasm

• Where calcium binds with troponin

• None of the answers are correct.