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Consider the following diagram showing four stages (A-D) of muscle contraction and select the option with the incorrect information regarding these stages.
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Important Questions on Locomotion and Movement

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Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Calcium important in skeletal muscle contraction because 
MEDIUM
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Choose the incorrect statement about muscle contraction from the following:
EASY
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Neurotransmitter released at the neuromuscular junction of a voluntary muscles is:
EASY
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
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
MEDIUM
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Sliding filament theory can be best explained as:
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Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Regulatory proteins in a myofibril are
EASY
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Name the ion responsible for the unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
EASY
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
The part of sarcomere that contains both thick and thin filaments are present in ________.
HARD
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

How does muscle cells change their shape?

HARD
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Due to constant writing, muscles of hands show fatigueness because_____.
EASY
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Which one of the following proteins does not play a role in skeletal muscle contraction?
HARD
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

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
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Myoglobin helps in the transport of oxygen in _______.
MEDIUM
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Which of the following is not a character of red muscle?
MEDIUM
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
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>Human Physiology>Locomotion and Movement>Muscular System of Humans
Assertion (A) : Skeletal muscle fibre is in syncytial state
Reason (R):  It is formed by fusion of cells
HARD
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Which type of tissue is correctly paired with its location?
EASY
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Distinguish between red muscle fires and white muscle fibres,
EASY
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Which of the following will NOT be triggered by the release of acetylcholine in the synapse at the neuromuscular junction during muscle contraction?
EASY
Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans
Identify the correct statement with reference to shortening of sarcomere