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Test: Mechanism of Muscle Contraction (NCERT) - NEET MCQ


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15 Questions MCQ Test Biology Class 11 - Test: Mechanism of Muscle Contraction (NCERT)

Test: Mechanism of Muscle Contraction (NCERT) for NEET 2024 is part of Biology Class 11 preparation. The Test: Mechanism of Muscle Contraction (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Mechanism of Muscle Contraction (NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Mechanism of Muscle Contraction (NCERT) below.
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Test: Mechanism of Muscle Contraction (NCERT) - Question 1

The slow twitch muscle fibres which are rich in myoglobin and have abundant mitochondria are

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 1

Muscles contain a red coloured pigment called myoglobin that stores oxygen. Some muscles have high content of myoglobin which gives them reddish appearance. Such muscles are called red muscles. Such muscles have abundant mitochondria and show slow rate of contraction for long periods that's why they are called slow twitch muscles.

Test: Mechanism of Muscle Contraction (NCERT) - Question 2

The figures given here represent three different conditions of sarcomeres. Identify these conditions and select the correct option.

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 2

In the given figure A, the length of the two sarcomeres is normal i.e., the muscle is in relaxed state. In figure B. the length of sarcomeres, shortens, H-zone narrows and size of l-band decreases i.e., the muscle is contracting. In figure C, the length of sarcomere further shortens and H-zone disappears and l-band further decreases i.e., the muscle is maximally contracted.

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Test: Mechanism of Muscle Contraction (NCERT) - Question 3

Which of the following is the contractile protein of a muscle?

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 3

The contractile protein of a muscle is myosin. Myosin constitutes 55% of muscle protein by weight. The thick filaments consist mainly of myosin protein. A myosin molecule consists of six polypeptide chains, two identical heavy chains and four light chains.

Test: Mechanism of Muscle Contraction (NCERT) - Question 4

If a stimulus, several times greater than the threshold stimulus is provided to a muscle fibre, it will

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 4

A muscle fibre would contract only when it receives stimulation of certain intensity called threshold stimulus. Response of a muscle fibre to a stimulus is not proportional to its intensity. It is absent when the intensity is subliminal. Muscle fibre contracts to the maximum whether the stimulus has threshold value or supraliminal value.

Test: Mechanism of Muscle Contraction (NCERT) - Question 5

Which of the following ions help in muscle contraction?

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 5

In muscle contraction, both Ca2+ and Mg2+ are used. Ca2+ helps in the formation of actomyosin by combining actin and myosin proteins. This will provide contraction in muscle. ATPase activity of myosin requires both Ca2+ and Mg2+. This helps in release of energy. This energy is used up in the contraction of muscle.

Test: Mechanism of Muscle Contraction (NCERT) - Question 6

In a muscle undergoes rapid contraction and relaxation, the sarcoplasmic reticulum extension

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 6

Sarcoplasmic reticulum of muscle cells store Ca2+ ions. During contracting of muscle, Ca2+ ions are released from sarcoplasmic reticulum to sarcoplasm and vice versa occurs during relaxation. Therefore, if a muscle undergoes rapid contraction and relaxation it requires constant plugging in and out of Ca2+ ions from sarcoplasmic reticulum.

Test: Mechanism of Muscle Contraction (NCERT) - Question 7

Which of the following is incorrect regarding muscle contraction?

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 7

During muscle contraction, chemical energy is converted into mechanical energy.

Test: Mechanism of Muscle Contraction (NCERT) - Question 8

Myoglobin is present in

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 8

Myoglobin (red coloured oxygen storing pigment) is present in all muscle fibres. Red muscle fibres have abundant myoglobin while white muscle fibres have less myoglobin

Test: Mechanism of Muscle Contraction (NCERT) - Question 9

Which of the following is correct regarding changes in muscle fibre from relaxed to contracted state in the given figure?

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 9

During muscle contraction, the cross-bridge of the myosin of thick myofilaments connect with portions of actin of the thin myofilaments. The myosin and the thin and thick myofilaments slide past each other. Length of A-band remains constant and actin filaments meet in the centre of the sarcomere. The Z-line comes closer and width of l-band decreases.

Test: Mechanism of Muscle Contraction (NCERT) - Question 10

In the resting muscle fibre, tropomyosin partially covers

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 10

When the muscle is at rest, the tropomyosin molecule covers the binding site of the actin molecule where interaction with myosin occurs. During contraction of the Tuscte the active site is uncovered, allowing the interaction of actin With myosin.

Test: Mechanism of Muscle Contraction (NCERT) - Question 11

Which one of the following options shown the next stage of muscle contraction after the stage given in question?

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 11

The figure in the question shows formation of cross bridge between myosin head and actin filament. Next stage would be the figure showing the sliding/rotation of the head of myosin filament of the actin filament.

Test: Mechanism of Muscle Contraction (NCERT) - Question 12

During muscular contraction, which of the following events occur?
(I) H-zoned is disappeared
(ii) A band widens
(iii) I band reduces in width
(iv) Width of A band is unaffected
(v) M line and Z line come closer.

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 12

Muscle contraction is brought about by sliding movement of actin filaments over myosin filaments. When a muscle fibril contracts, ita A band remain constant and I band shortens. H zone also disappears as the actin filaments of both sides in each sarcomere overlap each other at M-line. M-line and Z-line also come closer.

Test: Mechanism of Muscle Contraction (NCERT) - Question 13

Which of the following is the most abundant mineral element in the skeletal muscle?

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 13

Potassium is the most abundant mineral in muscles. It works closely with sodium in muscle function. All other minerals are present only in traces. So, the correct option is 'potassium'.

Test: Mechanism of Muscle Contraction (NCERT) - Question 14

Following is given a randomly arranged list of events that occur at neuromuscular junction to trigger muscle contraction.
(i) Receptor sites on sarcolemma
(ii) Nerve impulse
(iii) Release of Ca+2 from sarcoplasmic reticulum
(iv) The neurotransmitter acetylcholine is released
(v) Sarcomere shortern
(vi) Synaptic cleft
(vii) Spread of impulses over sarcolemma on TT-tubules
Which of the following gives the correct sequence of these steps?

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 14

a. As a nerve impulse( action potential) from a motor neuron arrives via its axon at the neuromuscular junction, the vesicles in the endplate release a neurotransmitter, the acetylcholine, into the nerve-muscle gap (synaptic cleft).
b. Acetylcholine depolarizes the postsynaptic muscle cell's sarcolemma and set up an action potential in the latter.
c. The action potential spreads deep into the interior of the muscle fibre via T- tubules and Z lines.
d. The incoming action potential changes the permeability of the SR, causing to release calcium ions.
e. The calcium ions bind to troponin molecules.
f. The latter change shape and shift position.
So, the correct answer is '(ii) →(iv)→(vi)→(i)→(vii)→(iii)→(v)'.

Test: Mechanism of Muscle Contraction (NCERT) - Question 15

Which of the following is a source of energy for muscle contraction?

Detailed Solution for Test: Mechanism of Muscle Contraction (NCERT) - Question 15

The energy for muscle contraction is obtained from ATP.

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