Contractile

... eat is not related to DNA in any way (though they were encoded by DNA, of course). That is, if you eat for example meat, most of the protein are contractile components of a muscle, namely actin, myosin and such, which are not directly associated with DNA. DNA itself typically contains certain ...

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If contractile strength is independent of muscle stretch and EDV ,but rather controlled by bloodborne chemicals (epinephrine, excess of Ca,thyroxine) which has little to do with the vagus (parasympathetic division) nerve, even ...

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You can't say "why." That presumes a "reason" exists. But consider what contractile vacuoles do - they effect osmoregulation in siolated cells such as those of paramecia. With very very few exceptions, human cels are organized - not isolated. Osmoregulation ...

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As in the osmoregulatory contractile vacuoles in paramecia? Human cells don't need individual means for osmoregulation as oiur cells are not free living,

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Why don't human body cells have contractile vacuoles?

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