1)During the _____ of sliding filament
model of contraction, the myosin head pivots and bends. As a result
it pulls on the thin filament, sliding it toward the center of the
sarcomere.

a. Cross bridge formation

b. Power stroke

c. Cross bridge detachment

d. Cocking of myosin head

2)Hydrolysis of _____ returns the
myosin head to the high-energy configuration during the sliding
filament model of contraction

a. ADP

b. ATP and potassium

c. ADP and phosphate

d. ATP

3)Some smooth muscle fibers in the
stomach and small intestine are pacemaker cells

a. True

b. False

4)When norepinephrine binds to its
receptors on the smooth muscle in the bronchioles, the muscle
contracts strongly, narrowing the bronchioles. This means the
effect is inhibitory

a. True

b. False

5)When the longitudinal layer of the
smooth muscle in an organ such as the intestine contracts, the
organ shortens

a. True

b. False

6)Cocking of myosin head means that the
myosin head returns to its prestrike low-energy
position

a. True

b. False