Physician. The reason fluid leaves at the arterial end of the capillary bed and returns to the venous end of the capillary bed is the difference in hydrostatic pressure.
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Answer Your brain can't see heat, ultraviolet light, radiowaves,  X-Rays, etc. with your naked eyes, because these different kinds of  light's wavelengths are either too lon â¦ g or too short for your naked  eyes to see. So that is why you can't see infrared.he two ligh energy waves that you can't see are ultra-violet (UV), and infra-red (IR).  Ultra-violet light waves are measured at 380nm and below, infra-red light waves are â¦ 750nm and above.  Normal light that you can see resides between these two regions.