Muscle Contraction and Sarcomere Quiz

How do muscles contract? What molecules are necessary for a tissue to change its shape?

What Is a Sarcomere?

The Sliding Filament Theory

An Analogy for Sliding Filaments in a Sarcomere Shortening Event

What Are Cross Bridges, and How Do They Relate to Sliding Filaments?

What Regulates Sarcomere Shortening?

Is muscle contraction completely understood?

The functional unit of a muscle cell is called a/an

• actin

• sarcomere

• myosin

• Z-line

The thin filaments in a muscle fiber are _____ and the thick filaments are ____.

• troponin; tropomyosin

• tropomyosin; actin

• actin; myosin

• myosin; actin

A muscle contraction is initiated when a _____ stimulates a muscle cell and _____ ions flood in.

• sensory neuron; sodium

• motor neuron; sodium

• sensory neuron; calcium

• motor neuron; calcium