Lab_Report_Bio_102 - Alex Shin Yuwen B5 March 7, 2007...

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Alex Shin Yuwen B5 March 7, 2007 Analysis of the Senses and the Capabilities of the Human Eye Dealing with Blind Spots, Field of Vision, and Afterimages, Sensory Receptors of the Skin, Reflexes Especially in the Knee, Adaption of Temperature receptors, Proprioception, and Central and Peripheral Nervous Systems to Natural Stimuli Abstract The reflexes of the human body were tested using a reflex hammer and striking the tendon right below the kneecap. The knee jerked indicating there was full functioning of the reflex arc that includes the receptor, sensory neuron, interneuron, motor neuron, and effector. The two-point threshold experiment tested the functionality of the mechanoreceptors. Using a caliper on various parts of the subject’s body, we recorded the minimal distance that he/she could differentiate the two needles. We found that certain areas of the body responded to this test in different manners proving that the mechanoreceptors were spread out in some places, and more condensed in others. The cheek of the face, for example, had much more condensed receptors than the forearm. The adaptation of sensory receptors was analyzed using an experiment of hot and cold receptors. We filled three beakers with water, one with cold, another hot, and the last lukewarm. Our subject placed one finger in the hot water, and with another finger from the other hand placed it into the cold water for about two minutes. Then he transferred both fingers into the lukewarm water and felt a sudden change in both fingers having the one that was in the hot water feel “cool” and the one that was in the cold water feel “warm”. To test he proprioceptors within the body by having the subject stand with arms out to the sides at shoulder height and eyes closed having him move his arms together without bending to try to touch the index fingers side Shin 1
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to side. There was almost always a small distance between the two fingers. However, when the subject’s eyes were open, the success rate was very high the distance between his two fingers was minimal, if anything at all. We tested the field of vision of the human eye and found that there was a blind spot when we covered one eye bringing a page with a cross and dot closer to the eye. Eventually the dot disappeared because it became outside the field of focus of the eye. Using a vision disc we tested the field of vision of each eye using an eye patch and found that the right eye had a wider range focused to the right, and the left eye towards the left. We repeated this process but instead used colored markers to test the distribution of cones in each eye. We used blue, green, red, and yellow markers and generally found a similar result to the prior experiment. To test the eye of afterimages, we placed a pink rectangle with a yellow cross over it on one piece of paper. We stared at the image for 60 seconds then quickly stared at a plain white sheet of paper and saw that the rectangle had turned yellow, while the cross turned pink.
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This lab report was uploaded on 04/06/2008 for the course BIO 102 taught by Professor Brey during the Spring '08 term at Rutgers.

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Lab_Report_Bio_102 - Alex Shin Yuwen B5 March 7, 2007...

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