EASY
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The ‘thick’ filament in muscles is polymerised protein of:

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Important Questions on Structural Organisation in Animals

MEDIUM
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Which of the following statements about muscles are correct?
(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
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Which one of the following proteins does not play a role in skeletal muscle contraction?
HARD
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue

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.

HARD
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Calcium important in skeletal muscle contraction because 
MEDIUM
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Which of the following is not a character of red muscle?
MEDIUM
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Choose the incorrect statement about muscle contraction from the following:
EASY
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Myoglobin helps in the transport of oxygen in _______.
HARD
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Due to constant writing, muscles of hands show fatigueness because_____.
EASY
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Neurotransmitter released at the neuromuscular junction of a voluntary muscles is:
EASY
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Identify the correct statement with reference to shortening of sarcomere
HARD
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Which type of tissue is correctly paired with its location?
MEDIUM
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Sliding filament theory can be best explained as:
EASY
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Assertion (A) : Skeletal muscle fibre is in syncytial state
Reason (R):  It is formed by fusion of cells
EASY
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
The part of sarcomere that contains both thick and thin filaments are present in ________.
HARD
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue

How does muscle cells change their shape?

MEDIUM
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Statement I: T- tubule of muscle fibre and the two terminal cisternae at its sides from the triad system
Statement II: Actin is a motor protein that is able to convert chemical energy into mechanical energy
EASY
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue

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

EASY
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Arrange the following in a sequence from edge to centre in a sarcomere.
A) M-line
B) Z-line
C) H-zone
D) I-band
EASY
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Name the ion responsible for the unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
EASY
Biology>Structural Organisation in Organisms>Structural Organisation in Animals>Animal Tissue
Regulatory proteins in a myofibril are