09. What is a major difference in the mechanism of contraction between striated

Question

09. What is a major difference in the mechanism of contraction between striated and smooth muscles?

a. Ca++ is not required in smooth muscle contraction.
b. Actin-myosin sliding underlies striated muscle contraction.
c. Contraction is not initiated by action potentials in smooth muscles.
d. Smooth muscles can actively lengthen.
e. In smooth muscles, configuration change in the myosin head is mediated by

phosphorylation instead of ATP hydrolysis.

01. The membrane of smooth muscle cells:
a. does not generate action potentials.
b. does not respond to stretching of the cells.
c. has a potential more negative than that in most other cells.

d. is affected by potential changes of adjacent cells.
e. has a resting potential close to zero.

Explanation / Answer

9)

e. In smooth muscles, configuration change in the myosin head is mediated by

phosphorylation instead of ATP hydrolysis.

10)d. is affected by potential changes of adjacent cells.

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