MEDIUM
Earn 100
A - band in skeletal muscle doesn't contain:
50% studentsanswered this correctly
Important Questions on Structural Organisation in Animals
EASY
EASY
EASY
MEDIUM
(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.
EASY
Reason : It is formed by fusion of cells
HARD
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.
EASY
HARD
How does muscle cells change their shape?
EASY
HARD
EASY
EASY
-line
-line
-zone
-band
MEDIUM
EASY
HARD
EASY
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
HARD
MEDIUM
MEDIUM
Select the correct option for the given statements in reference to muscle contraction.
Statements.
X = Actin slides over myosin
Y = Light meromyosin join with actin
Z = Myosin and Actin actually do not contract
MEDIUM
