EXPH 386 ch.7 pt 3 Exam Questions and Answers Fully Solved Latest Update 2025-2026
A single multinucleated muscle fiber contains ______ that lie ______ to the fiber's long axis -
AnswersMyofibrils
Parallel
Functional unit of the muscle fiber - AnswersSarcomere
The sarcomere consists of the ______ unit between two z-lines - AnswersRepeating
The sarcomere has a _______ pattern - AnswersCross-striation
Defines the sarcomere boundaries - AnswersZ-line
The z-line adheres to the _____ to provide ______ - Answerssarcolemma
Stability
Represents the light area of the sarcomere; contains actin only - AnswersI-band
Represents the dark area of the sarcomere; this is due to the overlap of actin and myosin -
AnswersA-band
The center of the A-band, contains myosin only - AnswersH zone
The center of the sarcomere; myosin filaments extend from it - AnswersM-line
What band shortens during muscle contraction? - AnswersA-band
Sarcomeres in series are attached at ______ by the protein ____ - AnswersAdjacent z-lines
Alpha-actinin
Sarcomeres in parallel are _____ at z-lines by the protein ____ - AnswersAnchored
Desmin
During contraction, sarcomeres shorten from _____ to _____ - Answers2.0 microns
, 1.4 microns
Series sarcomeres favor _____ and _____ - AnswersVelocity
ROM
Parallel sarcomeres favor ____ and _____ - AnswersForce
Power
What skeletal muscles use series arrangement - AnswersAsk Jake
What skeletal muscles use parallel arrangement? - AnswersAsk jake
What are the two contractile proteins - Answersactin and myosin
Actin: the ____ filament, interacts with myosin - AnswersThin
Myosin: the _____ filament, represents the _____ protein of skeletal muscle; produces movement
by the energy of _____ - AnswersThick
Motor
ATP
What contractile protein is more abundant in skeletal muscle - AnswersMyosin
What are the structural, cost americ proteins - Answers1. Alpha-actin
2. Desmin
3. Titin
4. Dystrophin
Alpha-actin: approximately ___% of the z-line protein; holds the actin filament in place ____ -
Answers7
Spatially
A single multinucleated muscle fiber contains ______ that lie ______ to the fiber's long axis -
AnswersMyofibrils
Parallel
Functional unit of the muscle fiber - AnswersSarcomere
The sarcomere consists of the ______ unit between two z-lines - AnswersRepeating
The sarcomere has a _______ pattern - AnswersCross-striation
Defines the sarcomere boundaries - AnswersZ-line
The z-line adheres to the _____ to provide ______ - Answerssarcolemma
Stability
Represents the light area of the sarcomere; contains actin only - AnswersI-band
Represents the dark area of the sarcomere; this is due to the overlap of actin and myosin -
AnswersA-band
The center of the A-band, contains myosin only - AnswersH zone
The center of the sarcomere; myosin filaments extend from it - AnswersM-line
What band shortens during muscle contraction? - AnswersA-band
Sarcomeres in series are attached at ______ by the protein ____ - AnswersAdjacent z-lines
Alpha-actinin
Sarcomeres in parallel are _____ at z-lines by the protein ____ - AnswersAnchored
Desmin
During contraction, sarcomeres shorten from _____ to _____ - Answers2.0 microns
, 1.4 microns
Series sarcomeres favor _____ and _____ - AnswersVelocity
ROM
Parallel sarcomeres favor ____ and _____ - AnswersForce
Power
What skeletal muscles use series arrangement - AnswersAsk Jake
What skeletal muscles use parallel arrangement? - AnswersAsk jake
What are the two contractile proteins - Answersactin and myosin
Actin: the ____ filament, interacts with myosin - AnswersThin
Myosin: the _____ filament, represents the _____ protein of skeletal muscle; produces movement
by the energy of _____ - AnswersThick
Motor
ATP
What contractile protein is more abundant in skeletal muscle - AnswersMyosin
What are the structural, cost americ proteins - Answers1. Alpha-actin
2. Desmin
3. Titin
4. Dystrophin
Alpha-actin: approximately ___% of the z-line protein; holds the actin filament in place ____ -
Answers7
Spatially
