Each Myofibril in a muscle fiber is surrounded by …

IMSPQ P1 - Muscle Physiology Quiz

Quiz
•
Health Sciences
•
University
•
Hard
Pandji Nurikhwan
Used 2+ times
FREE Resource
20 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Epimysium
Perimysium
Endomysium
Sarcoplasmic Reticulum
Sarcolemma
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The thin filament is formed by aggregation of …-protein into a …-protein
Globular-protein into a filamentous-protein
Globular-protein into a fibrous-protein
Myosin-protein into a contractile-protein
Tropomyosin-protein into a regulatory-protein
Troponin-protein into a complex-protein
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which characteristic or component is shared by skeletal muscle and smooth muscle?
Thick and thin filaments
Troponin
Elevation of extracellular [Ca2+] for excitation-contraction coupling
Spontaneous depolarization of the membrane potential
High degree of electrical coupling between cells
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Repeated stimulation of a skeletal muscle fiber causes a sustained contraction (tetanus). Accumulation of which solute in intracellular fluid is responsible for the tetanus?
Na+
K+
Cl-
Mg2+
Ca2+
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In skeletal muscle, which of the following events occurs before depolarization of the T tubules in the mechanism of excitation-contraction coupling?
Depolarization of the sarcolemmal membrane
Opening of Ca2+ release channels on the sarcoplasmic reticulum (SR)
Uptake of Ca2+ into the SR by Ca2+ - ATPase
Binding of Ca2+ to troponin C
Binding of actin and myosin
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following causes rigor in skeletal muscle?
Lack of action potentials in motoneurons
An increase in intracellular Ca2+ level
A decrease in intracellular Ca2+ level
An increase in ATP level
A decrease in ATP level
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Smooth muscle has T tubule. Does it true?
True, but only in specialized smooth muscle cells
False, smooth muscle lacks T tubules but has caveolae instead
Partially true, smooth muscle has structures functionally similar to T tubules
True, smooth muscle contains modified T tubules for calcium signaling
False, smooth muscle relies on caveolae for calcium influx instead of T tubules
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