Eyes!!!

Oh was this lecture exciting or what!! I dont know what it is about talking about the eye, but it made my eyes hurt, lol!! I am finding the 3 hours hard to sit through and pay attention, but this past week was kinda hard because after taking the test and then having to focus for another 2 someodd hours just about fried my brain, But I survived. haha..

ok back to the eyes.....

Some interesting things that I learned is that our Rods and Cones determine what we see. Frist light comes into the eye and enters the forea. The Forea is the shallow depression where light goes. The light has to pass through 3 layers on cells to reach the rods and cones. The Rods and cones are in the deepest layer in the eye. The Cone cells are sensitive to types of light like green, red and blue. They give sharpness to images. The Rod cells are sensitive to shades of gray - from black to white. We all know the colors of the rainbow by Roy G. Biv with R standing for red and red having the longer wavelength. B standing for blue have shorter wavelengths.

Now I also learned that rod and cone cells cannot regenerate, if they did no one would be blind.

Another cool thing is that the lens in our eye is held there by suspensory ligaments. Little tiny ligaments hold our lens in place. the human body is so amazing!!! It only gets better, We also have a canal of Shlem which is a tube inside the cilliary body which is constantly producing Aquias Humor. But oh no, the eye does not get filled with this liquid. It is reabsorbed because the eye is constantly producing more than it knows what to do with. Eevntually when you get old you might get Glacoma.

Towards the end of class the discussion of cGMP and GMP was disscused. cGMP keeps Na+ channels open. GMP keeps Na+ channels shut. The Cis-Retinal activates the g-protein which causes a subunit P and activates an enzyme called Adenylate Cyclase which generates GTP and turns it into cGMP and gluamate is released. Every portien has 3 subunits.
The last paragraph is kinda off, it is just what I had in my notes and I cannot remember much about it. If anyone can correct me please do! Have a good Vacation guys!