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BIO 231 Quiz 5- chapter 9
Terms in this set (14)
What produces the striations of a skeletal muscle cell?
arrangement of the myofilaments
Which of the following surrounds the individual muscle cell (fiber)?
What is the functional unit of skeletal muscle called?
The muscle cell inside the membrane is called the ----
Muscle tissue has all the following properties EXCEPT---
Identify the region of the sarcomere in the diagram
What is the role of tropomyosin in skeletal muscles?
Tropomyosin serves as the contraction inhibitor by blocking the myosin binding sites on the actin molecules.
What structure in skeletal muscle cells functions in calcium storage?
During muscle contraction, myosin cross bridges attach to which active sites?
Rigor mortis occurs because ________.
no ATP is available to release attached actin and myosin molecules
When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?
The refractory period
Which of the following is the correct sequence of events for muscle contractions?
Motor neuron, action potential, neurotransmitter release, muscle cell action potential, release of calcium ion from the SR, ATP driven power stroke, and sliding of the myofilaments.
After nervous stimulation stops, what prevents ACh in the synaptic cleft from continuing to stimulate contraction?
Troponin, a major protein in thin filaments, is a globular protein with three polypeptide subunits. Which of the following is NOT a function of the troponin?
One sub-unit binds to K+ ions. (Note: Troponin is all about Ca+. K+ is in the sarcolemma and at the neuromuscular junction with the chemically-gated cation channel that allows Na+ to go in and K+ to go out)
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