Choose the correct option by considering the following statements:
(i) During muscle contraction, chemical energy is converted into mechanical energy.
(ii) Both actin and myosin are present in A-band.
(iii) Only myosin is present in H-zone.
(iv) Muscular tissue is endodermal in origin.
(ii) Both actin and myosin are present in A-band.
(iii) Only myosin is present in H-zone.
(iv) Muscular tissue is endodermal in origin.
Important Questions on Locomotion and Movement
During muscular contraction which of the following events occur?
(a) 'H' zone disappears
(b) 'A' band widens
(c) 'I' band reduces in width
(d) Myosin hydrolyzes ATP, releasing the ADP and Pi
(e) Z-lines attached to actins are pulled inwards.
Choose the correct answer from the options given below.
Assertion (A): Skeletal muscles have very limited power of regeneration.
Reason (R): Satellite cells are present in them.
The correct option among the following is
(i) Muscles show three essential properties such as excitability, conductivity and contractility.
(ii) Muscular tissue is endodermal in origin except muscle of iris and ciliary body.
(iii) The cytoplasm of muscle fibre has several myofibrils.
(iv) Skeletal muscles exhibit slow and prolonged contractions.
(v) The regular arrangement of myosin and actin filaments is responsible for alternate dark and light bands of striated muscle.
Reason (R): The above said molecules have a role in masking and unmasking the active sites on actin.
-line
-line
-zone
-band
Statement II: Actin is a motor protein that is able to convert chemical energy into mechanical energy
How does muscle cells change their shape?
