DQuestion 1 2 pts Which of the following individuals would you expect to have th
ID: 3513617 • Letter: D
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DQuestion 1 2 pts Which of the following individuals would you expect to have the highest number of mitochondria in the skeletal muscle fibers of their legs? An Olympic sprinter An Olympic marathon runner A running back in the NFL A relatively inactive person They would all have the same amount of mitochondria in their leg muscles. D Question 2 2 pts As you travel from sea level to the summit of Mt. Everest (8,848 meters above sea level): The fraction of the atmosphere composed of O2 (Fo2) changes. Atmospheric pressure (Patm) increases. Atmospheric pressure (Patm) decreases The partial pressure of O2 (Po2) decreases. Both Patm and Po2 decrease.Explanation / Answer
Ans.1.
The choice is, Olympic marathon runner.
An Olympic marathon runner would have highest number of mitochondria in the skeletal muscle fibres of their legs.
Mitochondrial volume density (MitoVD) increases by 40% with exercise training and which depends upon the intensity of training.
MitoVD = 80% Mito IMF(Intermyofibrillar mitochondria)+ 20% Mito SS(Subsarcolemmal mitochondria).
Mitochondrial hypertrophy is responsible for exercise induced increase MitoVD. Higher MitoVD is observed in deltoid muscles of cross country runners.
Ans.2.
The choice is, Both Patm and Posterior2 decreases.
As we travel higher from sea level to higher altitude both the atmospheric pressure and partial pressure of oxygen decreases. Atmospheric pressure and partial pressure of oxygen fall linearly with increasing altitude. At height of 5500m above sea level it is 50% and at a height of 8848m above sea level it is 30%.
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