MEDIUM
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Why Rigor Mortis occurs after death ?

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
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
The globular head of myosin contains
MEDIUM
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 (ATP) of muscle contraction and select the option with incorrect information regarding these stages ?

Question Image
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

Biology Question Image

MEDIUM
Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation
Which statement is correct for muscle contraction?
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 (A-D) of muscle contraction and select the option with the 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:
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?
EASY
Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation
The energy that is released by the hydrolysis of ATP by actin is used for:
MEDIUM
Biology>Human Physiology>Skeleton and Movement>Muscle Contraction and Relaxation

Fill in the blank with the correct option provided in the bracket.

In a muscle fibre Ca++ is stored in _____ (sarcoplasmic reticulum/Golgi body/mitochondria).