ANATOMY
LIMB VASCULATURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The optimal length-tension relationship for cardiac muscle is when the fibers are at rest?
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true
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false
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -In cardiac muscle the resting sarcomere length is 1.6 mm due to the large amount of connective tissue. This places the resting sarcomere length on the left hand ascending limb of the active tension curve.
Detailed explanation-2: -At the length at which maxi-mum active tension is developed, the passive tension applied to the preparation of skeletal muscle is close to zero, whereas in cardiac muscle it is 50 to 80% of the active tension and may even exceed it.
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