General_Biology_Lab_Report_2

General_Biology_Lab_Report_2 - Analysis of the Nervous...

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Analysis of the Nervous System Regarding Special Senses: Skin Receptors, Smell Receptors, Proprioceptors, Photoreceptors, and Sensory Adaptation Abstract: Introduction: In this lab, the special senses of the nervous system such as skin receptors, smell receptors, proprioceptors, and photoreceptors were tested. In the two-point threshold of touch receptors, it was predicted that the threshold at which only one pin was felt would change between more and less sensitive parts of the body. The two-point threshold is the smallest distance beyond this threshold, in which a person can still feel two individual points (Scott, 2004). Skin receptors are denser in areas more adapted for precise touch sensitivity, such as finger tips. In the location of pain receptors test, it was predicted that the ability to feel pain would be greater in some areas where the skin is sensitive and must be protected. The sensitivity of certain areas of the body varies largely due to the fact that skin receptors are scattered and more heavily clustered in certain areas (Scott, 2004). In the adaptation of smell receptors, it was predicted that with time, the receptors would adapt to a certain smell, and eventually the precise smell stimulus would eventually yield no response. This phenomenon, known as the sensory adaptation, yields that with some sensory receptors, responses to specific stimuli decreases and eventually ceases with time and constant exposure. It was also predicted that smells are specific and the adaptation to one does not result in the adaptation to another. It was predicted also that hot and cold receptors work in much the same way, with adaptation to either hot or cold stimuli.
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In the proprioception it was predicted that a person would be more able to touch their fingers side to side with their eyes open than with their eyes closed. It was also predicted that a person would be more able to maintain a position, such as hands extended with one leg up, once again with their eyes open than with their eyes closed. Proprioceptors enable the determination of position, movements, and muscle conditions. Stretch receptors which function as Proprioceptors use the stretching and contraction of muscles to determine the position of body parts. Pacinian corpuscles, which are proprioceptors in joints, are coordinated with stretch receptors to coordinate body movements, and largely rely on vision for accuracy (Scott, 2004). In the field of vision test, it was predicted that the full vision, even if out of a certain eyes field of vision, would be perceived. This is due to the fact that an object does not need to be only in the overlapped portion of the field of vision; rather an object merely in the fully lateral field, in which the right or left field compensates for each other, can be perceived in full. In the distribution of cones test, it was predicted that the field of color vision would have a smaller arc than the field of vision, and that field of color vision for red, blue, green, and yellow would each respectively be different.
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General_Biology_Lab_Report_2 - Analysis of the Nervous...

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