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physiology exam 3 practice
Questions and Answers (100%
Correct Answers) Already Graded A+
What is the role of tropomyosin in skeletal muscle contraction?
Ans: It blocks the binding sites on actin when calcium levels
© 2026 Assignment
are low
Which protein is involved in the thick filament of skeletal
Guru01 - Stuvia
muscle and is crucial for muscle contraction? Ans: Myosin
Expert
Which structure within the skeletal muscle cell stores calcium
ions and releases them during muscle contraction? Ans:
Sarcoplasmic reticulum
What is the primary physiological role of ATP in skeletal
muscle contraction? Ans: ATP binds to myosin, allowing cross-
bridge detachment
What distinguishes cardiac muscle from skeletal muscle? Ans:
Cardiac muscle is striated and involuntary, while skeletal
muscle is striated and voluntary.
Actin Ans: Thin filament protein that interacts with myosin to
enable contraction.
Troponin Ans: Regulatory protein that binds calcium and
affects tropomyosin.
Sarcoplasmic Reticulum (SR) Ans: Organelle that stores and
releases calcium ions.
physiology exam 3 practice
Questions and Answers (100%
Correct Answers) Already Graded A+
What is the role of tropomyosin in skeletal muscle contraction?
Ans: It blocks the binding sites on actin when calcium levels
© 2026 Assignment
are low
Which protein is involved in the thick filament of skeletal
Guru01 - Stuvia
muscle and is crucial for muscle contraction? Ans: Myosin
Expert
Which structure within the skeletal muscle cell stores calcium
ions and releases them during muscle contraction? Ans:
Sarcoplasmic reticulum
What is the primary physiological role of ATP in skeletal
muscle contraction? Ans: ATP binds to myosin, allowing cross-
bridge detachment
What distinguishes cardiac muscle from skeletal muscle? Ans:
Cardiac muscle is striated and involuntary, while skeletal
muscle is striated and voluntary.
Actin Ans: Thin filament protein that interacts with myosin to
enable contraction.
Troponin Ans: Regulatory protein that binds calcium and
affects tropomyosin.
Sarcoplasmic Reticulum (SR) Ans: Organelle that stores and
releases calcium ions.
