A healthy person at rest takes in and expels about 500ml of air in one respiratory cycle, called the tidal volume. If one takes in a very deep breath, it is possible to inhale 3 litres of air over and above the tidal volume. This is called the inspiratory reserve volume. After the end of a normal expiration, it is possible to exhale an extra 1 litre of air. This is called the expiratory reserve volume.
The total amount of air exhaled after taking the deepest possible breath is called the vital capacity. In an average healthy adult, the vital capacity is about 4.5 litres.
Menial mechanical work can have much higher vital capacity which may exceed 6 litres. After a maximum expiration, about one and a half litres of air remains in the lungs. This is called the residual volume.
Energy requirement by gender
Humans varying energy depending on sex, age and level of activity. Generally, females require less energy than males which is mainly due to their smaller size and lower level of activity. A healthy adult man at complete rest requires about 6000 kg. Extra energy is required for doing mechanical work and this depends on the level of activity. For example, an adult man doing office work or teaching will require a total of about 12000kg per day. An adult woman doing the same job will require about 9500kg. A man doing heavy manual work such as digging will require about 20000kg per day.
In the above explanation means that men can inhale higher infectious corona virus dose than women.
“Men accounted for 253 cases, which are nearly seven in ten people. There are 10105 cases out of 215,037 tests and majorities have been men.” said health cabinet secretary Mutahi Kagwe in a statement sent to newsrooms on Sunday, July 12, 2020.
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Senior Public Health Officer