Releted MCQ Question on
Zoology >> Locomotion and Movement
Releted Question 1
Calcium is important in skeletal muscle contraction because it
A.
Binds to troponin to remove the masking of active sites on actin for myosin
B.
Activates the myosin ATPase by binding to it
C.
Prevents the formation of bonds between the myosin cross bridges and the actin filament
D.
Detaches the myosin head from the actin filament
Releted Question 2
Lack of relaxation between successive stimuli in sustained muscle contraction is known as
A.
Spasm
B.
Fatigue
C.
Tetanus
D.
Tonus
Releted Question 3
Sliding filament theory can be best explained as:
A.
Actin and Myosin filaments shorten and slide pass each other
B.
Actin and Myosin filaments do not shorten but rather slide pass each other
C.
When myofilaments slide pass each other, Myosin filaments shorten while Actin filaments do not shorten
D.
When myofilaments slide pass each other Actin filaments shorten while Myosin filament do not shorten
Releted Question 4
The $$H$$-zone in the skeletal muscle fibre is due to:
A.
The central gap between myosin filaments in the $$A$$-band
B.
The central gap between actin filaments extending through myosin filaments in the $$A$$-band
C.
Extension of myosin filaments in the central portion of the $$A$$-band
D.
The absence of myofibrils in the central portion of $$A$$-band