HARD

Earn 100

Statements:
A. A-bands of the muscle are dark and contain myosin.
B. I-bands are the light bands and contain actin.
C. During muscle contraction the A-band contracts.
D. The part between the two Z-lines is called as sarcomere.
E. The central part of thin filament, not overlapped by thick filament is called H-zone.
With respect to the above statements select the correct option.

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Important Questions on Locomotion and Movement

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?

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

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

How does muscle cells change their shape?

EASY

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

Myoglobin helps in the transport of oxygen in _______.

EASY

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

Identify the correct statement with reference to shortening of sarcomere

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

HARD

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

Which type of tissue is correctly paired with its location?

MEDIUM

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

Sliding filament theory can be best explained as:

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

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

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.

HARD

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

Calcium important in skeletal muscle contraction because

EASY

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

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

In a striated myofibril, the F-actin of thin filament is formed by

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.

MEDIUM

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

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