ï»¿ Â Briefly explain hypertrophy and atrophy. from Biology Locomotion and Movement Class 11 Assam Board

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Â Briefly explain hypertrophy and atrophy.

Hypertrophy : Increase in the size of muscles is called hypertrophy. Increase in the size of muscle may occur due to exercise. Due to repeated and forceful contraction of muscles, mass of muscle increases and so does the number of mitochondria, filaments in sarcomeres and amount of sarcoplasm.

Atrophy : Decrease in the size of muscle is called atrophy. Atrophy is due to immobilization of muscles. Mass of muscles decreases due to decrease in number of mitochondria, filaments in sarcomeres and amount of sarcoplasm. An injury to a nerve which supplies a muscle can also cause atrophy

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how many pairs of floating ribs are present in humns?

2
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Total number of pair of ribs?

12
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Which pairs are called false ribs?

8th, 9th and 10th pairs of ribs are called as false ribs or vertebrondral ribs.
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What is the rib cage made of ?

The thoracic vertebrae, ribs and sternum together form the rib cage.Â
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