Bundle: NROS Tests

what is the dark current and what causes it - Answer -Dark current is the pumps and channels that are involved in the Visual Signal Transduction Pathway -In the dark, there is an increase in cGMP What effect does light have on the membrane potential of rods and cones - Answer -an increase in...

Define adaptation - Answer Reduction of sensory responsiveness when stimulation is unchanging. It prevents us from having to respond continuously to unimportant information Explain the adaptation process for the visual pathway - Answer Low levels of Ca++ activate recoverin which activates rho...

Why does the brain interpret both positive and negative signals? - Answer What matters is that there is a change (+/-). As long as circuitry is set up to respond to that change. Dark Current - Answer In dark PRC, CNGC open because cGMP is around to open them = increase in Ca and Na and decrea...

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Why are there motor proteins associated with both actin filaments and microtubules but not intermediate filaments? - Answer Actin filaments and microtubules are highly polarized, therefore allowing motor proteins to form associations with them. Intermediate filaments are unpolarized and do not bin...

Why does the organization of the eye guarantee that we have a blind spot? Why can't we normally detect the blind spot? - Answer Lack of photoreceptors in this area because it is where the optic nerve and blood vessels exit the eye. We cannot detect the blind spot because we use our surroundings t...

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Combined Definition of Threshold - Answer Threshold is the voltage where the probability of the S4 domain movement applied to the number of available voltage gated Na+ channels results in an inward current that overcomes the outward current and triggers positive feedback leading to an action poten...

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What are the main organs affected by cystic fibrosis? - Answer Lungs, any organ that has epithelial cells, mucus, and secretory system which requires regulation of that mucus Describe the main function of the CFTR protein and how it is regulated. - Answer responsible for regulating the proper...

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