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APHY 101 Ivy Tech Exam 3 Midterm
- What is the role of tropomyosin in skeletal muscles?
ANS * Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
- What structure in skeletal muscle cells functions in calcium storage?
ANS sar- coplasmic reticulum
- Creatine phosphate functions in the muscle cell by
ANS storing energy that can be transterred to ADR to resynthesize ATP
- During muscle contraction, myosin bridges attach to which active sites?
ANS - actin filaments 1 / 2
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- The contractile units of skeletal muscles are ANS Myofibrils
- Sarcomeres are functional units of muscle
ANS cardiac & skeletal
- What is the functional role of the T tubules?
ANS enhance cellular communication during muscle contraction
- When a muscle is unable to respond to stimuli temporarily, it is in which of
the following periods?ANS *refractory period
- Which of the following is the correct sequence of events for muscle contrac-
tions? ANS motor neuron action potential neurotransmitter release, muscle cell action potential, release of calcium ions from SR. ATP driven power stroke, sliding of myofilaments
- The sliding filament model of contraction involves
ANS actin and myosin sliding past each other and partially overlapping
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