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NEETZoologyLocomotion and Movement

Read the following statements and choose the following option: 1. Muscle fibre is lined by plasma membrane called plasmalemma 2. Sarcoplasmic reticulum is the storehouse of sodium ions. 3. Utilising the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross bridge. 4. The ‘Z’ line attached to these actins are also pulled inwards thereby causing contraction

Options

  1. AOnly 4 is correct
  2. BBoth 1 and 2 are correct
  3. COnly 3 is correct
  4. DBoth 1 and 2 are incorrect

Correct answer

D. Both 1 and 2 are incorrect

Step-by-step solution

Muscle fibre is lined by the plasma membrane called sarcolemma enclosing the sarcoplasm.,The ‘Z’ line attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere, i.e., contraction.

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