The training effect, in which individuals experience improvements in physical fitness as they continue a regular exercise regimen, is a product of All of the choices are correct. increased number of mitochondria in muscle cells. increased number of capillaries in muscles. increased efficiency of the heart.

- increased production of lactic acid by muscles

- increased number of mitochondria in muscles

- increased number of capillaries in muscles

Explanation:

The 'training effect' is an outcome of all the above changes in one's body that leads him/her to encounter advancement in their physical fitness post pursuing a continuous exercise routine. Regular exercise assists the body in enhancing its ability to produce more lactic acid, mitochondria, and capillaries that improve the body's strength and metabolism that shield it from diseases, muscle cramps, and make him feel fitter, stronger, and healthier. The exercise keeps one energized throughout the day to work efficiently without getting strained due to the above factors and hence, it is promoted that one should follow a regular exercise regimen.

answer:

24

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Explanation:

https://www.seattlecca.org/diseases/brain-spinal-cord-cancers/brain-spinal-cord-cancers-facts/anatomy-brain-and-spinal-cord