Why can\'t we increase only the cardiac output or only the minute respiratory ra

Question

Why can't we increase only the cardiac output or only the minute respiratory rate to improve oxygen delivery when we exercise? Under these mismatchconditions why would some hemoglobin not reach full oxygenation?

Why is lactic acid formed when the VO2 is insufficient and why does it appear in the bloodstream? Why does this occur right before you become exhausted and stop exercising?

What could happen to a person if you increased their heart rate enough to allow you to experimentally determine theri VO2 max?

What happens to the metabolic activity of your muscle cells if you exceed your Vo2 max?

Explanation / Answer

Cardiac output generally defined as the amount of blood pumped by heart each minute. During exercise the cardiac output generally increases depending upon your physical activity and the heart beats much faster than normal, so that more blood gets out to the body and it also pumps more forcefully than usual. Under this conditions some partial pressure exists so haemoglobin cannot reach with full oxygenation. Lactic acid is formed when there is insufficient oxygen delivery,due to this NADH cannot release H+ and they buid up in the cell. To prevent the rise in acidity pyruvic acid accepts H+ and forms lactic acid and it resynthesized to form glucose and provides the whole energy to the body. This occurs because it is the basic mechanism of respiratory system. During exercise generally the heart rate of the person increases, as the excersise intesities increase the amount of oxygen from blood also increase and there occur a difference in VO2 max. So from that we can deterimine a higher VO2 max or lower VO2 max. If the Vo2 max exceeds there will be a greater absorption and utilisation of oxygen in the working muscles and thus provides the athletes to work at high potential rates and the increase in VO2 max is considered as an indicator of cardiovascular fitness.

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