The molecular structure of myosin includes all of the following Except
Anonymous Quiz
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
Anonymous Quiz
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
Anonymous Quiz
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
Anonymous Quiz
9%
A. sarcolemma
8%
B. sarcoplasm
79%
C. sarcomere
3%
D. sarcoplasmic reticulum
36_duringmuscle relaxation..........convertto.......
Anonymous Quiz
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:
Anonymous Quiz
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 :
Anonymous Quiz
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 :
Anonymous Quiz
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 :
Anonymous Quiz
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 :
Anonymous Quiz
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 .
Which one of the following factors increase the excitability of skeletal muscles
Anonymous Quiz
29%
High calcium ion concentration in the extracellular fluid.
60%
Low calcium ion concentration in the extracellular fluid
6%
Neuromuscular blockers.
4%
Local anathetic drags
Which one of the following factors decrease the excitability of skeletal muscles
Anonymous Quiz
57%
High calcium ion concentration in the extracellular fluid.
33%
Low calcium ion concentration in the extracellular fluid
2%
Anticholinestrase enzyme
8%
Cholinomimetic drugs
Which one of the following factors would increase the mechanical efficiency of the muscle
Anonymous Quiz
7%
Excessive cooling of the muscle.
20%
Muscle fatigue.
61%
Training.
13%
Isometric contraction.
Which one of the following factors would decrease the mechanical efficiency of the muscle
Anonymous Quiz
12%
When carbohydrates is the main source of energy.
75%
Muscle fatigue.
7%
Training.
5%
Isotonic contraction.
Low calcium ion concentration in the extracellular fluid increase the excitability of muscle cells due to
Anonymous Quiz
18%
Hyperpolarization of muscle cells
45%
Increase the membrane permeability to sodium
20%
Increase the membrane permeability to potassium
18%
Increased duration of action potentials
Increases excitability of muscle cells is due to:
Anonymous Quiz
44%
High extracellular calcium
40%
low extracellular calcium
10%
spinal anesthesia
6%
low extracellular potassium
ุฃุณุฆูุฉ ูุณููููุฌู ุนูู ุงู skeletal muscles
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ุฃุชู ูู ุชุฏุนูููุง ูุง ุดุจุงุจ ุนูุดุงู ุงูุญุงูุฉ ุตุนุจุฉ ูุงููู ๐ฅฒ๐
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