Unit 06 Practice Quiz
Your LAST Name:
1. Creatine phosphate (CP) functions within the muscle cells by
forming a chemical compound with actin
storing energy that will be transferred to ATP to resynthesize ADP as needed
storing energy that will be transferred to ADP to resynthesize ATP as needed
inducing a conformational change in the myofilaments
forming a temporary chemical compound with myosin
2. Which of these events must occur first to trigger the skeletal muscle to generate an action potential and contract:
acetylcholinesterase (AchE) breaks down acetylcholine (ACh)
diffusion of potassium ions out of cell
operation of the sodium-potassium pump
acetylcholine (ACh) causes temporary permeability to sodium
sodium ions rush into the cell
3. The axon terminals of a nerve cell and the sarcolemma of a skeletal muscle cell join at the:
4. The mechanical force of contraction is generated by:
the "accordian-like" folding of thin and thick filaments
the temporary disappearance of thin filaments
shortening of the thin filaments
shortening of the thick filaments
a sliding of thin filaments past thick ones
5. During skeletal muscle contraction, myosin cross bridges attach to active sites of:
the H zone
6. Which one of the following functions do calcium ions perform during skeletal muscle contraction:
release the inhibition on Z discs
bind to regulatory proteins on the myosin filaments, changing both their shape and their position on the thick filaments
expose myosin binding sites on the actin
increase the action potential transmitted along the sarcolemma
cause ATP binding to actin
7. Neurotransmitters are released upon stimulation from a nerve impulse by the:
sarcolemma of the muscle cell
axon terminals of the motor neuron
8. The amount of oxygen needed to support the conversion of lactic acid to glycogen is called the
9. Increasing the frequency of stimulation so that a muscle contracts without relaxation is called
10. When a calcium ion binds to troponin,
muscle relaxation occurs.
all of these choices
tropomyosin moves out of the groove between the actin molecules.
actin heads will bind to myosin.
active sites on the myosin are exposed.
TRUTHFULLY, how hard did you study for this test?
Study, I don't study.
If I studied any harder, I'd have your job.
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