1. When you change your focus from a near to a far object, what occurs in the eye that allows you to focus on the object? (Answer should include muscle involved). 2. What is the anatomical basis for the blind spot? 3. Given the number of blood vessicles in the retina, why do you suppose that you are not able to see them normally? 4. Why don't we see a hole where our blind spot it? 5. Why is color blindness much more common in males than females? 6. What is the trigeminal nerve's role in olfaction? Why might a trigeminal response to smell be of benefit to us? 7. People with conductive deafness often speak quietly. People with sensorineural deafness tend to speak louder than normal. Explain the differences. 8. Explain why drinking alcohol in excess gives an inebriated person the feeling that the bed is spinning?