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What induces muscle relaxation?

Important Questions on Skeleton and Movement

EASY

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

Name the ion responsible for the unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

HARD

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

Calcium important in skeletal muscle contraction because

EASY

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

Identify the correct statement with reference to shortening of sarcomere

MEDIUM

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

Sliding filament theory can be best explained as:

EASY

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

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

EASY

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

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

EASY

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

The globular head of myosin contains

MEDIUM

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

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

	A	B	C
(i)	Contracting	Relaxed	Maximally contracted
(ii)	Relaxed	Contracting	Maximally contracted
(iii)	Maximally contracted	Contracting	Relaxed
(iv)	Relaxed	Contracted	Contracting

MEDIUM

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

Consider the following diagram showing four stages (ATP) of muscle contraction and select the option with incorrect information regarding these stages ?

Question Image

MEDIUM

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

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

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Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

Which statement is correct for muscle contraction?

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Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

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 Ca²⁺ from sarcoplasmic reticulum
(iv) The neurotransmitter acetylcholine is released
(v) Sarcomere shortern
(vi) Synaptic cleft
(vi) Spread of impulses over sarcolemma on T-tubules

Which of the following gives the correct sequence of these steps?

MEDIUM

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

Consider the following diagram showing four stages (A-D) of muscle contraction and select the option with the incorrect information regarding these stages.
Question Image

EASY

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

During muscular contraction, which of the following events occur?
(i) H-zone disappears
(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

EASY

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

Which of the following is essential for muscle contraction?

HARD

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

Which of the following option shows correct order of some stages of muscle contraction from the beginning to the end of the process?

EASY

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

Choose the wrongly matched pair.

MEDIUM

Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

Which is not true for red fibres?