PSL300 Muscle physiology Exam
Questions and Answers Graded A+
Muscle classifications - Correct answer-Skeletal, smooth, cardiac muscle
Skeletal muscle fibers - Correct answer-Large, multinucleate cells that appear
striped or striated under the microscope (striation).
Cardiac muscle fibers - Correct answer-Striated but Smaller, branched, and
uninucleate.
Intercalated disk (cardiac muscle) - Correct answer-Cells are joined in series by
that junction
smooth muscle - Correct answer-Fibers are small and lack striation, muscle around
stomach and construct internal organ.
skeletal muscle contain - Correct answer--activation by the somatic nervous system
- motor neurons
-NMJ
-contractile filaments in sarcomeres; striated
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, -well developed sarcoplasmic reticulum (SR)
A motor unit consists of - Correct answer-a motor neuron and the muscle fibers it
innervates
neuro-muscular junction (NMJ) - Correct answer-A synapse between the axon
terminals of a motor neuron and the sarcolemma of a muscle fiber (cell), chemical
signaling
sarcroplasmic reticulum (SR) - Correct answer-
muscle fascicle - Correct answer-bundle of muscle fibers wrap around and wiring
Muscle consists of - Correct answer-Muscle fibers extended length from tendon to
tendons, connective tissue, nerve and blood vessels.
Myofibrils - Correct answer-Thick and thin filaments structures that make up
muscle fibers, surrounded by sarcoplasmic reticulum and T-tubes
muscle fiber - Correct answer-a single muscle cell with multinuclei
sarcolemma, T-tubules, sarcoplasmic reticulum - Correct answer-Contraction of
skeletal and cardiac muscle is initiated when a wave of electrical depolarization
spreads over the plasma membrane, which in muscle cells is called the _____. This
wave of electrical depolarization penetrates into the interior of the muscle cell via
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Questions and Answers Graded A+
Muscle classifications - Correct answer-Skeletal, smooth, cardiac muscle
Skeletal muscle fibers - Correct answer-Large, multinucleate cells that appear
striped or striated under the microscope (striation).
Cardiac muscle fibers - Correct answer-Striated but Smaller, branched, and
uninucleate.
Intercalated disk (cardiac muscle) - Correct answer-Cells are joined in series by
that junction
smooth muscle - Correct answer-Fibers are small and lack striation, muscle around
stomach and construct internal organ.
skeletal muscle contain - Correct answer--activation by the somatic nervous system
- motor neurons
-NMJ
-contractile filaments in sarcomeres; striated
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
, -well developed sarcoplasmic reticulum (SR)
A motor unit consists of - Correct answer-a motor neuron and the muscle fibers it
innervates
neuro-muscular junction (NMJ) - Correct answer-A synapse between the axon
terminals of a motor neuron and the sarcolemma of a muscle fiber (cell), chemical
signaling
sarcroplasmic reticulum (SR) - Correct answer-
muscle fascicle - Correct answer-bundle of muscle fibers wrap around and wiring
Muscle consists of - Correct answer-Muscle fibers extended length from tendon to
tendons, connective tissue, nerve and blood vessels.
Myofibrils - Correct answer-Thick and thin filaments structures that make up
muscle fibers, surrounded by sarcoplasmic reticulum and T-tubes
muscle fiber - Correct answer-a single muscle cell with multinuclei
sarcolemma, T-tubules, sarcoplasmic reticulum - Correct answer-Contraction of
skeletal and cardiac muscle is initiated when a wave of electrical depolarization
spreads over the plasma membrane, which in muscle cells is called the _____. This
wave of electrical depolarization penetrates into the interior of the muscle cell via
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
