Question

Assertion :Thigh muscles can get tired but not the muscles of the ventricles of the heart. Reason: Muscles of thigh are voluntary whereas that of heart are involuntary muscles.

• A. If both the assertion and the reason are true and the reason is correct explanation of the assertion
• B. If both the assertion and the reason are true but the reason is not 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

Answer 1

The correct option is B If both the assertion and the reason are true but the reason is not correct explanation of the assertion

• The thigh muscles are the striated muscles that soon get fatigued due to overwork. These muscles show fast contractions and then tire immediately due to the accumulation of lactic acid.
• The muscles of the heart wall are the cardiac muscles that do not fatigued easily and show rhythmic and automatic contractions. They have specialized regions of the cell membranes which function as boosters for muscle contraction waves.
• Thigh muscles are called voluntary muscles because they can be moved at the will of the organism whereas heart muscles can't be moved at one's will and therefore are involuntary.

So, the correct answer is 'B'.