Learning diary blog 3

The chapters 8 to 10 seemed to separate from the previous ones by including more examples which made it more interesting. The basic mechanisms and anatomy of eye and palate was already familiar but the sensory processes itself were almost completely new. The difficult part of the chapters was the transduction mechanisms on different receptors. There are lot of similarities between them but also many little differences which confuse the entirety. For example, the ion channel response differs between G-protein-coupled neurotransmitter receptor and photopigment. Also, the names for different structures are sometimes hard to remember, for example the different parts which belongs to process, where light flows from photoreceptors to optic nerve; 1. photoreceptors (in human eye rod or cone)à(horizontal cells) 2. bipolar cells à (amacrine cells) 3. ganglion cells and their axons à out of the eye to brain.

The palate particularly seems interesting; how it can be possible that we can recognize so many different odours? It was new that tongues different parts are specialized to different odours, for example tip of the tongue recognize most to the sweetness. Anyway, the parts are sensitive to other odours too, not only the odour it is specialized to. In the tongue is papillae which consist of taste buds. It was interesting that different odours get the depolarization on different ways, for example in sourness, HCL dissolves and H+ can bind to and block K+ channels. Potassium’s permeability decreases and happens depolarization.

Eyes structure was reviewed properly in the book. It was interesting to see how the image is formed in the retina and which issues affect to form the picture in the wrong place and how it can be fixed whit different lenses. If you do not see close properly and have hyperopia you need lenses which are convex. In turn, if you do not see far and have myopia, you need concave lenses.

It like to dive eyes open, so it was nice to know why everything looks blurry underwater. It causes of lights speed in medium if it quite same than lights speed in eyes structure the force of cornea ends and comes blurry.

What kind of things can be done by transferring different receptor cells from place to another? Or could it be possible for example to confuse our rods and cones to do the opposite as they should with drugs; cones would work in low light and rods in daylight?

Also, it sounds interesting and somehow difficult to imagine that “We see because our eyes have photoreceptors. If our tongue had photoreceptors, we might see with our mouth.”

Posted by NBE-E4210-AH

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