Skeletal Muscle Contraction Quiz

What type of control are skeletal muscles subject to?

• Involuntary control

• Reflex control

• Conscious control

• Automatic control

Which of the following is the ability of muscle tissue to receive and respond to stimuli?

• Contractility

• Extensibility

• Excitability

• Elasticity

Which characteristic of muscle tissue refers to its ability to be stretched?

• Elasticity

• Extensibility

• Excitability

• Contractility

Excitability in muscle tissue is also known as:

• Responsiveness

• Flexibility

• Contractility

• Elasticity

What is the Z disc in muscle striation?

• The region where thick and thin filaments overlap

• The lighter region in the midsection of the dark A band where filaments do not overlap

• The line of protein myomesin that bisects the H zone

• The coin-shaped sheet of proteins on the midline of the light I band that anchors thin filaments and connects myofibrils to one another

What happens to the I bands during muscle contraction?

• I bands lengthen

• I bands shorten

• I bands disappear

• I bands stay the same

What happens to the A bands during muscle contraction?

• A bands lengthen

• A bands shorten

• A bands disappear

• A bands move closer together

What is the effect of muscle contraction on the length of the sarcomere?

• The sarcomere lengthens

• The sarcomere shortens

• The sarcomere stays the same length

• The sarcomere disappears

What is the primary function of the sliding filament model of contraction?

• To lengthen muscle fibers

• To shorten muscle fibers

• To thicken muscle fibers

• To thin muscle fibers

What is the effect of muscle contraction on the Z discs?

• Z discs move closer together

• Z discs move further apart

• Z discs disappear

• Z discs stay the same