Why Rigor Mortis occurs after death ?

Important Questions on Skeleton and Movement

EASY

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

Identify the correct statement with reference to shortening of sarcomere

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.

EASY

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

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

HARD

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

Calcium important in skeletal muscle contraction because

MEDIUM

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

Sliding filament theory can be best explained as:

MEDIUM

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

Upon stimulation of skeletal muscles calcium is immediately made available for binding to troponin from:

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.
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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?

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

MEDIUM

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

If a second stimulus is applied to a muscle which is still in contraction phase, a second contraction is added to first and results in greater muscle shortening that is caused by a single Contraction, it is

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?

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 ?

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