Bio2_lab_report

Bio2_lab_report - Arpit Patel C-7 March 10, 2005 The Human...

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Arpit Patel C-7 March 10, 2005 The Human Nervous System and Responses to Sensory Stimuli Involving Touch, Pressure, Position, and Eye Receptors. Abstract : Studying the nervous system allows us to further understand the intricacies that govern the way in which our body works. The first experiment conducted was one involving the reflex arc. When tapping the knee with a hammer the knee automatically jerks upward, this is an evolutionary antigravity response to keep the body from falling backward. The two-point threshold test is another experiment conducted to test receptors in the skin. The purpose of this experiment is to test different areas of the body and the concentration of receptors in these specific locations by lightly pressing two pins that converge until it feels like only a single pin is being pressed down. Receptors are more likely to be found in areas such as the palm of the hand where reception is more crucial rather than on the leg. Another experiment was also conducted for location of pain receptors in the hand. This time stamping the hand with a grid of boxes and testing each box with a pin to for a response to pain. The palm and the back of the hand were tested to show that the palm of the hand had a higher concentration of pain receptors than the back of the hand. Proprioreceptors are another kind of vital receptors that are found in the body to help us determine where we are in relation to other parts of the body. An experiment to show the effectiveness of the receptors, involves a patient that closed their eyes and
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had their thumbs moved in different locations and they were still able to locate the position of their thumb without actually seeing it with their own eyes. Introduction: Although we could not function properly without the cooperation with all the other bodily systems, the nervous system is the most vital. It is one of the first systems that begin to develop from when we are still a very young embryo. It allows us to receive and react swiftly to outside stimuli. This involves interpretation and coordination of the muscular systems for movement. All of this would not be possible without the nervous system. In the knee-jerk reflex experiment we hypothesized that the quadriceps would flex when a hammer hit an area below to the knee. This shows how the human reflex arc can react to a stimulus without sending the information to the brain first. The two-point threshold test is a test that helps determine the distance between touch receptors on the skin. Our predictions and hypothesis coincided as areas in the body where touch receptors would function more there is a higher density of. The next test was very similair but looked for concentration of pain receptors in the skin instead of touch receptors. Again we predicted that in the palm of the hand there are more of these receptors. This happens because the palm of the hand would function more in touch and feeling than the back of the hand or areas of the arm so concentration of these receptors allows for a more adept
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Bio2_lab_report - Arpit Patel C-7 March 10, 2005 The Human...

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