Page 93 - 84 human physiolofy part-1

Senses

causes your eyes to dilate. This was used in the middle ages by women who wanted to look more
attractive for men. To this day, it is still used by opthamologists. How this works is that the
atrophine is a competitor with acetylcholine. The Nightshadow goes into your receptors on the
postsynaptic membrane of an action potential. This makes it so that the acetylcholine doesn’t
have any receptor site so the Na ion is not able to be released.

Critical Thinking

1. Explain why you are normally unaware of your blind spot.
2. Stare at a bright light for 10 seconds and then stare at a white sheet of paper. What do you
observe and why?
3. What is it that makes things "dissapear" when you are staring at them at night, and how do
you make them reappear?
4. Name what rods are sensitive to and also what cones are sensitive to.
5. Explain how Deadly Nightshade works.

The Senses Of Hearing

The ear is the sense organ that detects sound and plays a major role in the sense of balance and
body position. It is also a device used for collecting and funneling sound waves recieved by the ear.
The sensory receptors for both hearing and equilibrium are found in the inner ear, consisting of hair
cells that have stereocilia (long mircovilli). The stereocillia are extremely sensitive to mechanical
stimulations, which are known as mechanoreceptors.

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