New answers tagged human-anatomy
From the nose to the bronchi: pseudostratified columnar ciliated epithelial cells. From the small bronchi cartilage is being replaced by elastic tissue. Bronchioles: ciliated simple epithelium with club cells (known as Clara cells). Also they lack cartilage and glands. Alveoli are covered with squamous alveolar cells which form the wall (also known as ...
No, retina doesn't have or has too few infrared receptors. Practical example: most remote controls use IR LEDs (infra red light emitting diodes) to send commands to a receiver device. So take a remote control, keep pressing a button and look at its front. Do you see any flashing light? Now take a camera (phone camera, photo camera or video camcorder) and ...
Infrared light is emitted by warm things, like our head. We'd be detecting it ambiantly all the time. That's why animals that can detect infrared are not warm-blooded.
The optic nerve fibers cross inside the optic chiasm sharing the same shell: The crossing fibers go ones between others, like on this classical picture -
According to an article in Vision Research Volume 50 issue 2 : "The face’s vertical distance between the eyes and the mouth is approximately 36% of its length, and the horizontal distance between the eyes is approximately 46% of the face’s width." The article can be found at: http://www.sciencedirect.com/science/article/pii/S0042698909005045
Look at this scheme - As I stated before, vitreous is 99% water and is not an organ itself, thus the "replacement of vitreous" is actually = 99% water re-production and the only organ inside the eye which can perform this - ciliary body. Consequently, if the vitreous was removed and replaced by gas or saline it will be replaced by aqueous which produced ...
Let us say this myopic patient has amplitude of accommodation of 8D. The patient accommodates 8D beyond far point, thus his near point is 1/6+8=0.07m (7.1cm). If we compare the case with emmetropic eye with accommodation amplitude of 8D, the near point is 1/8=0.12m (12cm). So, yes, near point of myopic person is different from an emmetropic one. But, you ...
I'm pretty sure this doesn't exist. If it did, that would be awesome. The following is 100% pure speculation with nothing to back this up at all (as a disclaimer). Phosphorus-31 (the stable isotope) is NMR active, which means that you could theoretically use an MRI machine to visualize phosphorus. A quick google search shows scientists attempting to use ...
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