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MULTIPLE CHOICE 1.The striated appearance of skeletal muscle due to the a.orderly

Question : MULTIPLE CHOICE 1.The striated appearance of skeletal muscle due to the a.orderly : 1417080

MULTIPLE CHOICE

1.The striated appearance of skeletal muscle is due to the

a.orderly arrangement of the T tubules

b.orderly arrangement of the lateral sacs of the sarcoplasmic reticulum

c.orderly arrangement of the thick and thin filaments into A and I bands

d.orderly arrangement of the motor units

e.presence of white and red muscle fibers within the muscle

2.Muscle fibers develop tension by

a.contraction of sarcomeres

b.shortening

c.the pushing of myosin by actin

d.all of the above

e.both a and b

3.Myosin

a.is found in the A band

b.is found in the I band

c.is in the thin filaments

d.shortens during muscle contraction because it is one of the contractile proteins

e.is found in the Z line

4.Myosin is

a.found in the I band

b.attached to tropomyosin

c.a regulatory protein

d.all of the above

e.none of the above

5.Actin

a.has ATPase activity

b.are spherical

c.forms a helical chain that forms the main structural component of the thin filaments

d.has characteristics a and b

e.has characteristics b and c

6.Actin

a.does not perform a power stroke during muscle contraction

b.contains a globular head that forms a cross bridge between the thick and thin filaments

c.is not found within A bands

d.is inhibited by Ca2+

e.does not attach to the Z lines

7.Thick filaments in skeletal muscle are composed of

a.actin

b.troponin and tropomyosin

c.myosin

d.all of the above

e.only b and c

8.Sarcomeres are arranged end to end as

a.Z lines

b.myofibrils

c.T tubules

d.myofilaments

e.cross bridges

9.Each I band in a skeletal muscle fiber includes

a.overlapping thin and thick filaments

b.thick filaments and one Z disc

c.thin filaments and one Z disc

d.thin filaments and two Z discs

e.actin, troponin, tropomyosin and two Z discs

10.Z lines

a.are formed by the T tubules

b.extend down the middle of the I band

c.are formed by cross bridges

d.are part of the thin filaments

e.extend down the middle of the sarcomere

 

1

 

Solution
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Biology 2 Years Ago 96 Views
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