Bio 122 April 13, 2015
This lab explored some aspects of human sensory biology. We performed tests on touch, temperature, and visual sensors on our bodies. At the end of these exercises we had gathered enough information to perform a some T-tests. The exercises gave us a chance to explore and understand our own sensory systems.
The nervous system is essential in many living organisms. The ability to perceive and sense the world that we are immersed in is crucial to the survival of many highly evolved species. Sensory information can give an organism the ability to react appropriately to its environment.
Homeostasis is the ability to counteract changes in the environment with certain effectors. In order for an organisms to implement homeostasis they must have three things: The ability to sense changes in the environment, A control center to process sensory information, and a effectors that can counteract the changes in the environment. These types of changes often include changes in temperature, ph balance, salinity or even moving to avoid predators. The information provided by our sensory receptors is the first step in homeostasis.
The human nervous system is made up of neurons, which fire electrical signals along a stem-like structure to other neurons. Each neuron has two parts. The cell body contains a nucleus and the axon (the stem-like structure mentioned above), and is in charge of sending signals to other neurons. The dendrites are a web-like structure around the cell body whose function is to receive signals from other neurons. (Carter, 2014) A complete nervous system has connections all throughout the body. In humans, and other vertebrates the center of o...
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...hat it doesn’t see as a threat. In exercise 2, we noticed that temperature receptor at different points on the body can adapt to different temperatures. Exercise 3 explored more in depth with touch receptors on the body. It was interesting to note how far away two points must be for our brain to distinguish them as two points. This proved that sensory information is not always exact and that it is more like a wave of muddled information that our brain must analyze.
Dolphin W. D. 2010. Biological Investigations: Form, Function, Diversity & Process, 9th Edition. Boston: McGraw Hill.
￼￼￼Carter, James S. "Nervous Systems and Senses." Nervous Systems and Senses. University of
￼Clermont, n.d. Web. 14 Apr. 2015.Reece, Urry, Cain, Wasserman, Minorsky, Jackson. Campbell
￼Biology Tenth Edition 2014.
￼Biology of Organisms Laboratory II Lab Manuel, Spring 2015.
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