WorksheetsMuscle Physiology Quiz
Total questions: 20
Worksheet time: 10mins
What is the basic contractile unit of a muscle fiber?
Myofibril
Sarcomere
Sarcolemma
Sarcoplasm
Z-lines in a sarcomere represent?
End of myosin
Attachment of actin
Center of sarcomere
End of sarcolemma
Which band shortens during muscle contraction?
A band
I band
H zone
Z line
Sliding filament theory involves interaction between?
Actin & Myosin
Calcium & ATP
Myosin & Tropomyosin
Actin & Troponin
What ion is essential for muscle contraction?
Sodium
Potassium
Calcium
Magnesium
Tropomyosin in resting state prevents binding of?
Myosin to actin
ATP to actin
Calcium to myosin
Actin to troponin
ATP is required for which step in muscle contraction?
Attachment of actin
Detachment of myosin
Release of calcium
Formation of troponin complex
Wallerian degeneration occurs in?
Distal part of cut axon
Proximal part
Cell body
Neuromuscular junction
Which cell aids regeneration of axons?
Schwann cell
Oligodendrocyte
Astrocyte
Microglia
Saltatory conduction occurs in?
Unmyelinated fibers
Myelinated fibers
Both
None
Node of Ranvier helps in?
Continuous conduction
Neurotransmitter release
Saltatory conduction
Impulse summation
Absolute refractory period is the phase during which?
No stimulus can elicit response
Stronger stimulus elicits response
Impulse travels slowly
Depolarization occurs
Which of the following has longest refractory period?
Skeletal muscle
Cardiac muscle
Smooth muscle
All equal
All-or-none law is best applicable to?
Nerve fibers
Cardiac muscle
Individual muscle fiber
Skeletal muscle bundle
Red muscle fibers have high content of?
Glycogen
Myoglobin
Actin
DNA
Which muscle type is involuntary and striated?
Skeletal
Cardiac
Smooth
Multinucleated
Skeletal muscle differs from smooth muscle in having?
Single nucleus
Striations
Involuntary control
Actin and myosin
Which muscle type shows functional syncytium?
Skeletal
Cardiac
Smooth
All of the above
Troponin is absent in which muscle type?
Skeletal
Cardiac
Smooth
None
Which muscle fiber type is fatigue resistant?
Fast glycolytic
Slow oxidative
Fast oxidative glycolytic
White muscle
