Bio 253 Exam #3 Practice Exam Questions With Verified Answers
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Course
Bio 253
Institution
Bio 253
Bio 253 Exam #3 Practice Exam Questions
With Verified Answers
What structure in skeletal muscle permits action potentials to penetrate deep into the muscle cell?
- answerT-tubules
what molecule initiates cross bridge cycling in skeletal muscle by binding to troponin? -
answerCa++
the link bet...
Bio 253 Exam #3 Practice Exam Questions
With Verified Answers
What structure in skeletal muscle permits action potentials to penetrate deep into the muscle cell?
- answer✔✔T-tubules
what molecule initiates cross bridge cycling in skeletal muscle by binding to troponin? -
answer✔✔Ca++
the link between actin and myosin in skeletal muscle is broken when the myosin head binds a
molecule of ____ - answer✔✔ATP
During skeletal muscle contractions, factor(s) that influence whole muscle tension are ____,
_____, ____ - answer✔✔# of motor unit recruited, length of fiber at onset of contraction,
frequency of stimulation
creatine phosphate is an important source of skeletal muscle ATP because - answer✔✔it is
catalyzed in the presence of ADP to produce creatine and ATP
Which of the following statements about tetanus is true? - answer✔✔it is a contraction of
maximum strength, all fibers in a muscle are recruited during tetanus, a maximum number of
cross bridge sites are uncovered
during smooth muscle contraction, Ca++ activates? - answer✔✔calmodulin
single-unit smooth muscle fibers are electrically linked by ______. - answer✔✔gap junctions
What type of muscle is (are) controlled by the autonomic nervous system - answer✔✔single-
unit, multi-unit, cardiac
blood in the venae cavae flows into the _____. - answer✔✔right atrium
a rapid repolarization of the membrane caused by K+ leaving the cell occurs in ? -
answer✔✔neurons, in contractile cardiac cells, and autorhythmic cardiac cells
depolarization of the membrane caused by Na+ entering the cell when threshold is reached
occurs - answer✔✔in neurons, in contractile cardiac cells
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