A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
Muscle cells or muscle fibres are said to be contractile in nature because cells of muscle tissue can shorten forcefully and then can again return to the relaxed state. This specialised property is known as contractility. It is based on the organised arrangement of some protein filaments in the cytoplasm of a muscle cell. The cell shortens or relaxes according to the relative positions of different intracellular filaments. Whenever adequately stimulated, muscle cells respond by contracting. This property of the muscle tissue is responsible for the various movements in an animal.
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