Chapter 1: Skeletal Muscle Exam
Questions and Answers Graded A+
Perimysium - Correct answer-The connective tissue sheath surrounding each
muscle fasciculus.
Epimysium - Correct answer-The outer connective tissue that surrounds an entire
muscle, holding it together.
Sarcolemma - Correct answer-A muscle fiber's cell membrane, a selectively
permeable lipid layer coated by proteins.
Motor unit - Correct answer-A single alpha-motor neuron and all the muscle cells
(fibers) it innervates. (two words)
Tropomyosin - Correct answer-A tube-shaped protein that twists around actin
strands, fitting in the groove between them.
Endomysium - Correct answer-A sheath of connective tissue that covers each
muscle fiber.
Sarcoplasm - Correct answer-The gelatin-like interior of a muscle fiber.
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,Type II - Correct answer-A type of muscle fiber with a low oxidative capacity and
a high glycolytic capacity; recruited in speed and power activities. (two words)
Titin - Correct answer-An array of proteins that stabilize the myosin filaments.
Fascicles - Correct answer-A small bundle of muscle fibers wrapped in a
connective tissue sheath within a muscle.
Satellite cells - Correct answer-Cells located between the sarcolemma and the
basement membrane that help muscle cells adapt to growth, injury, and training.
Excitation-contraction coupling - Correct answer-The sequence of events that
triggers a muscle fiber to contract. (three words)
Type I - Correct answer-A type of muscle fiber that has a high oxidative and a low
glycolytic capacity, associated with endurance-type activities. (two words)
Troponin - Correct answer-A complex protein attached at regular intervals to actin
strands and tropomyosin.
Sarcomere - Correct answer-The basic functional unit of a myofibril.
Myosin - Correct answer-The thicker of the two major protein filaments
responsible for muscle contraction.
Myofibril - Correct answer-A grouping of numerous sarcomeres.
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, Rate coding - Correct answer-Refers to the frequency of impulses sent to a muscle.
Increased force can be generated through increase in either the number of muscle
fibers recruited or the rate at which the impulses are sent. (two words)
List the anatomical components that make up a muscle fiber. - Correct answer-
Plasmalemma, Sarcolemma, Satellite Cells, Sarcoplasm, Transverse Tubules,
Sarcoplasmic Reticulum, Myofibrils
Transverse Tubules - Correct answer-Extensions of the plasmalemma laterally
through a muscle fiber; interconnected; allow nerve impulses to be transmitted to
individual myofibrils
Sarcoplasmic Reticulum - Correct answer-Storage site for Ca2+
What are the steps in excitation-contraction coupling? - Correct answer-1)Action
potential (AP) starts in brain
2)AP arrives at axon terminal, releases acetylcholine (ACh)
3)ACh crosses synapse, binds to ACh receptors on plasmalemma
4)AP travels down plasmalemma, T-tubules
5)Triggers Ca2+ release from sarcoplasmic reticulum (SR)
6)Ca2+ enables actin-myosin contraction
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Questions and Answers Graded A+
Perimysium - Correct answer-The connective tissue sheath surrounding each
muscle fasciculus.
Epimysium - Correct answer-The outer connective tissue that surrounds an entire
muscle, holding it together.
Sarcolemma - Correct answer-A muscle fiber's cell membrane, a selectively
permeable lipid layer coated by proteins.
Motor unit - Correct answer-A single alpha-motor neuron and all the muscle cells
(fibers) it innervates. (two words)
Tropomyosin - Correct answer-A tube-shaped protein that twists around actin
strands, fitting in the groove between them.
Endomysium - Correct answer-A sheath of connective tissue that covers each
muscle fiber.
Sarcoplasm - Correct answer-The gelatin-like interior of a muscle fiber.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,Type II - Correct answer-A type of muscle fiber with a low oxidative capacity and
a high glycolytic capacity; recruited in speed and power activities. (two words)
Titin - Correct answer-An array of proteins that stabilize the myosin filaments.
Fascicles - Correct answer-A small bundle of muscle fibers wrapped in a
connective tissue sheath within a muscle.
Satellite cells - Correct answer-Cells located between the sarcolemma and the
basement membrane that help muscle cells adapt to growth, injury, and training.
Excitation-contraction coupling - Correct answer-The sequence of events that
triggers a muscle fiber to contract. (three words)
Type I - Correct answer-A type of muscle fiber that has a high oxidative and a low
glycolytic capacity, associated with endurance-type activities. (two words)
Troponin - Correct answer-A complex protein attached at regular intervals to actin
strands and tropomyosin.
Sarcomere - Correct answer-The basic functional unit of a myofibril.
Myosin - Correct answer-The thicker of the two major protein filaments
responsible for muscle contraction.
Myofibril - Correct answer-A grouping of numerous sarcomeres.
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, Rate coding - Correct answer-Refers to the frequency of impulses sent to a muscle.
Increased force can be generated through increase in either the number of muscle
fibers recruited or the rate at which the impulses are sent. (two words)
List the anatomical components that make up a muscle fiber. - Correct answer-
Plasmalemma, Sarcolemma, Satellite Cells, Sarcoplasm, Transverse Tubules,
Sarcoplasmic Reticulum, Myofibrils
Transverse Tubules - Correct answer-Extensions of the plasmalemma laterally
through a muscle fiber; interconnected; allow nerve impulses to be transmitted to
individual myofibrils
Sarcoplasmic Reticulum - Correct answer-Storage site for Ca2+
What are the steps in excitation-contraction coupling? - Correct answer-1)Action
potential (AP) starts in brain
2)AP arrives at axon terminal, releases acetylcholine (ACh)
3)ACh crosses synapse, binds to ACh receptors on plasmalemma
4)AP travels down plasmalemma, T-tubules
5)Triggers Ca2+ release from sarcoplasmic reticulum (SR)
6)Ca2+ enables actin-myosin contraction
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
