Which of the following splits ATP and the energy released powers the head forward to the next bind component on the actin filament?
a) troponin
b) tropomysin
c) myosin head
d) none of these
Which of the following necessary for the myosin head to continue to crawl along actin filament, thereby contracting the sarcomere and muscle?
a) calcium ions
b) ATP
c) ADP
d) both a and b
When the electrical impulse reaching the muscle fibre ceases, the sarcoplasmic reticulum begins to reaccumulate the..…
a) sodium ions
b) calcium ions
c) chloride ions
d) potassium ions
Explanation: calcium ions release from sarcoplasmic reticulum
The reacumulation of the calcium by sarcoplasmic reticulum during the recovery of muscle fibre is done by…….
a) Osmosis
b) diffusion
c) active transport
d) Exocytosis
During muscle relaxation, the calcium ion sequested in the sarcoplasmic reticulum sacs in
a) minutes
b) seconds
c) microseconds
d) milliseconds
Explanation: after this step, the binding between myosin-head and actin filament no longer occur
Muscle contraction is controlled by the…
a) sensor unit
b) motor unit
c) neuro-unit
d) none of these
Explanation: Motor unit is the smallest functional unit of the nervous system and it can be regarded as the final output of motor commands
