Humans suffer from sleepiness ,decreased muscle activity ,and decreased sex drive during illness because they are useful ways of conserving energy while the body is attacking the illness .
<h3>Sleepiness :</h3>
It is the strong desire to fall asleep .
Sleepiness relates to the accumulation of a chemical messenger ( neurotransmitter) ,within the brain called adenosine .
If the level of adenosine is higher then the level of sleepiness will be higher .
Sleepiness may occur normally or be due to sleep disorder.
if we tired, then also we feel sleepiness.
<h3>Decreased sex drive :</h3>
There many ways for having low sex drive .some of they are listed below: relationship problems ,stress ,anxiety or depression , erectile dysfunction or vaginal dryness , lower hormone levels ,menopause , high blood pressure , antidepressants , drinking too much alcohol , hormone disbalance in body and many more .
<h3>Decreased muscle activity : </h3>
Decreased muscle activity means reducing strength of the person .it is due to also natural aging or due to disease and illness . lack of physical activity also leads to laziness which is the cause of decreased muscle activity .if we have cold symptoms then also we lack muscle activity and feel laziness.
Learn more about ADENOSINE here :
brainly.com/question/7036579
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