Please can you explain the path in which oxygen takes to get to the blood stream

ps:mia hmu

The oxygen enters the bloodstream from the alveoli, tiny sacs in the lungs where gas exchange takes place.The transfer of oxygen into the blood is through simple diffusion. The oxygen-rich blood returns to the heart

Explanation:

the energy generated by an individual's metabolism is calculated in met (metabolic equivalent of task). the met is the ratio of the work metabolic rate to the resting metabolic rate. one met is illustrated as 1 kcal per kilogram per hour, and is probably equal to the energy cost of sitting quietly.

1 met is equal to 1.162 watt per kg

1 kg is equal to 1000 grams

as the person weighs 80000 gm, that is, 80 kg.

therefore, 80*1.162 = 92.96

thus, the person expends 92.96 watts of power while at rest.