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16

Short answer, your eyelids does not block all light. Since they are only a thin layer of skin, the light is able to pass through although not completely obviously. Since the eyes are still completely functional when you close them, only covered by the eyelids, you are able to see when light strikes your face.


9

There are 2 reasons for light to appear red through the eyelids. 1) Eyelids get a rich supply of blood which contains iron (in hemoglobin). The iron in blood absorbs all colors of light but reflects red light (reference). 2) Our tissue transmits red wavelengths of light very well, but it doesn't transmit blue or wavelengths of light towards the blue end of ...


2

No, they may not sense Earthquake by an organ but due to other reasons. This may be any other physical factors which can be measured. "...There is therefore little reason to believe that these ants react to earthquake precursors other, perhaps, than those that may affect colonies directly, by altering physical variables that can be directly ...


2

Actually No. Amazingly there is this paper published on the motions on Ants which says: The isotropic distribution of average speed appears as a surprising result since it would be expected, for instance, that ants progressing uphill should be slower than when moving downhill. For instance, Seidl et al. found lower speeds on steeper inclines in ...


2

Depends if your talking about interstitial fluid or lymph: As per starling forces: the oncotic pressure of the late capillary plus hydrostatic pressure of interstitial space, would be higher than oncotic pressure of interstitium [though I dunno why since intertitial GAGs are very water hungry and they are responsible for the negative (hydrostatic?) ...


1

Healthy young males have estradiol levels in the area of 20-30 pg/ml. Also, estrogen is a group of hormones, including estradiol and estrone for example. You shouldn't think of any hormones as women hormones or men hormones really, as both genders have them all, albeit in different proportions, and generated often through different pathways/organs. this ...


1

The pathophysiology of orthostatic hypertension has not been elucidated. It is believed it involves activation of the sympathetic nervous system [1], vascular adrenergic hypersensitivity and diabetic neuropathy [2]. High levels of plasma atrial natriuretic peptide and antidiuretic hormone were observed in children [3]. Hypovolemia causes: ...



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