Muscle Contraction and Relaxation

What is the most basic level of the muscular structure?

• Sarcolemma

• Sarcomeres

• Fibers

• fascicles

What is the main component of connective tissues?

• Actin

• Myosin

• Collagen

• Troponin

Which part of the muscle is an act of boundaries a connective tissue which holds the full muscle together?

• silverskin

• Collagen

• fascicles

• Fibers

Which among the following ions can depolarize the membrane before initiation of contraction in the muscle?

• Cl+

• Ca++

• Pi+

• Na+

It is the part of the muscle structure that invaginations of the plasma membrane, which are present exclusively in striated muscle

• Sarcolemma

• T-tubules

• Actin

• Myosin

which among the ions released by the sarcoplasmic reticulum?

• Ca++

• Pi+

• Cl+

• Na+

Which among the following is correct?

• As long as Ca⁺⁺ ions remain in the sarcoplasm to bind to troponin, and as long as ATP is available, the muscle fiber will continue to shorten.

• As long as Ca⁺⁺ ions is absent in the sarcoplasm to bind to troponin, and as long as ADP is available, the muscle fiber will continue to shorten.

• As long as Na⁺ ions remain in the sarcoplasm to bind to troponin, and as long as ATP is available, the muscle fiber will continue to shorten.

• As long as Ca⁺⁺ ions remain in the sarcoplasm to bind to troponin, and as long as Na+ is available, the muscle fiber will continue to shorten.

Which Among the following acts as regulator or preventer attachment of actin and myosin when Ca++ is absent in the muscle fiber?

• Myofibril

• Troponin-tropomyosin complex

• Thick Filament

• Thin Filament

which among the process is correct?

• The release of Ca++ it released the ATP and ADP and Pi that responsible of detachment of actin and myosin

• The release of Na+ it released the ATP and ADP and Pi that responsible of detachment of actin and myosin

• Absent of Na+ it released the Pi+ and ADP Due to ATP that responsible of detachment of actin and myosin

• Absent of Ca++ it released the Pi+ and ADP Due to ATP that responsible of detachment of actin and myosin

The tongue is an example of what type of muscle?

• Soft

• Cardiac

• Skeletal

• Smooth