Sarcoplasmic reticulum of skeletal muscle functions in which one of the
following ways?
following ways?
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64%
A. Cellular Calcium storage
15%
B. Cellular glycogen storage
9%
C. Glycogen degradation
12%
D. ATP synthesis
The endomysium is a connective tissue investment that surrounds
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42%
A. Individual muscle fibers
20%
B. Muscle fascicles
26%
C. Individual myofibrils
12%
D. An entire muscle
Contraction in all types of muscle requires calcium ions. Which of the
following muscle components can bind calcium ions?
following muscle components can bind calcium ions?
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16%
A.Rough endoplasmic reticulum
18%
B.Tropomyosin
56%
C.Troponin
10%
D.Active sites on actin
Sarcoplasmic reticulum represents
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19%
A. rough endoplasmic reticulum.
46%
B. smooth endoplasmic reticulum.
24%
C. both of them
11%
D. non of them
I- band of the sarcomere contains
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55%
A. actin filaments only.
6%
B. myosin filaments only
35%
C. both actin and myosin.
5%
D. non of them
A- band of the sarcomere contains
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15%
A. actin filaments only.
13%
B. myosin filaments only
66%
C. both actin and myosin.
6%
D. non of them
I- band of the sarcomere
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19%
A. contains actin microfilaments only.
11%
B. is intersected by Z.line
8%
C. related to two adjacent sarcomeres
62%
D. all of the above
The molecular structure of myosin includes all of the following Except
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58%
A. tropomyosin
12%
B. myosin heavy chains
8%
C. myosin light chains.
22%
D. Non of the above
The structural and functional unit of the skeletal muscle is called
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16%
A. sarcolemma
4%
B. sarcoplasm
76%
C. sarcomere
5%
D. sarcoplasmic reticulum
Instead of Z line, actin microfilaments of the smooth muscle fibers are attached to
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6%
A. caveolae
15%
B.endocytotic vesicles
61%
C. a system of tubules underneath the sarcolemma
18%
D. cytoplasmic and membranous dense bodie
The distance between two successive Z lines is called
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9%
A. sarcolemma
8%
B. sarcoplasm
79%
C. sarcomere
3%
D. sarcoplasmic reticulum
36_duringmuscle relaxation..........convertto.......
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10%
a) creatine phosphocreatine
10%
b) phosphocreatine creatine
29%
c) ADP _ATP
35%
d) a and c
15%
e) b and c
About sodium Potassium Atpase Pump all are except:
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25%
It uses ATP as energy.
20%
at the lumenal border
23%
result in low intracellular sodium and high intracellular kion
32%
non of the above
5 ) The primary role of calcium in the activation of skeletal muscle is :
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19%
a ) To cause depolarization of the muscle cell plasma membrane .
47%
b ) To remove the inhibition of the reaction between the action filaments and the myosin filaments .
25%
c) To activate the myosin molecules so that they can interact with actin filaments .
8%
d ) To help the release of Ca ++ from sarcoplasmic reticulum .
6 ) Concerning ATP in skeletal muscle contraction :
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25%
a ) ATP is necessary for Ca " release from the sarcoplasmic reticulum .
50%
b ) ATP is necessary for detachment of cross bridges during muscle contraction .
13%
c ) Increased cycling of cross - bridges reduces ATP consumption .
12%
d)Less ATpconsumedduringcontraction of fasttwitch skeletalmuscle thanduring cardiacmusclecontraction
7 ) During the cross - bridges cycle for activation of skeletal muscle contraction :
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24%
a ) Ca " combines with actin to expose an actin binding site .
45%
b ) ATP is used to cause myosin cross - bridges to release from the actin molecules .
20%
c ) The actin filament shortens to reduce the length of the sarcomere .
10%
d)Ca ++ combines with calmodulin .
22) In skeletal muscles , all the following is true except :
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13%
a ) Tropomyosin is found in the thin filaments
7%
b ) Myosin is found in the thick filaments .
24%
c ) The lateral sacs of sarcoplasmic reticulum are rich in Ca ++
56%
d ) Troponin C molecules bind Ca ++ Energy from ATP is not required for muscle relaxation .