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The functional unit contraction in myofibril is the portion present between two successive

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Important Questions on Locomotion and Movement

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.

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Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

Identify the correct statement with reference to shortening of sarcomere

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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

Choose the incorrect statement about muscle contraction from the following:

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

The part of sarcomere that contains both thick and thin filaments are present in ________.

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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?

MEDIUM

Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

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

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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.

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Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

Neurotransmitter released at the neuromuscular junction of a voluntary muscles is:

HARD

Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

Calcium important in skeletal muscle contraction because

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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

Assertion (A): Light meromyosin and Heavy meromyosin are often called regulatory proteins.
Reason (R): The above said molecules have a role in masking and unmasking the active sites on actin.

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.

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Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

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

Biology>Human Physiology>Locomotion and Movement>Muscular System of Humans

How does muscle cells change their shape?

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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?

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