BIO 253 Exam 3 Practice Questions |
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2024 Version
what structure in skeletal muscle permits action potentials to penetrate deep into the muscle cell? -
✔✔T-tubules
what molecule initiates cross bridge cycling in skeletal muscle by binding to troponin? - ✔✔Ca++
the link between actin and myosin in skeletal muscle is broken when the myosin head binds a molecule
of ____ - ✔✔ATP
During skeletal muscle contractions, factor(s) that influence whole muscle tension are ____, _____, ____
- ✔✔# 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 - ✔✔it is catalyzed in the
presence of ADP to produce creatine and ATP
Which of the following statements about tetanus is true? - ✔✔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? - ✔✔calmodulin
single-unit smooth muscle fibers are electrically linked by ______. - ✔✔gap junctions
What type of muscle is (are) controlled by the autonomic nervous system - ✔✔single-unit, multi-unit,
cardiac
blood in the venae cavae flows into the _____. - ✔✔right atrium
