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Case Study: John Woodbury - Harvard Life Science Outreach Program
Case Study: John Woodbury - Harvard Life Science Outreach Program

... encourage students to think critically and creatively about a particular topic. The nature of this educational tool is such that students are empowered to decide the direction of their research. By giving students necessary information piecemeal, they have time to focus on details while being motiva ...
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Exam 3 2008 - student.ahc.umn.edu
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chemical senses - (canvas.brown.edu).
chemical senses - (canvas.brown.edu).

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... B. In the extracellular fluid, the number of plus charges equals the number of minus charges. 3. An electrical charge difference, called a potential difference, exists across the plasma membrane. The potential difference can be measured by placing microelectrodes on either side of the plasma membran ...
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• In vertebrates
• In vertebrates

... neurons are distributed according to the body part that generates sensory input or receives motor input Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings ...
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Stimulus (physiology)



In physiology, a stimulus (plural stimuli) is a detectable change in the internal or external environment. The ability of an organism or organ to respond to external stimuli is called sensitivity. When a stimulus is applied to a sensory receptor, it normally elicits or influences a reflex via stimulus transduction. These sensory receptors can receive information from outside the body, as in touch receptors found in the skin or light receptors in the eye, as well as from inside the body, as in chemoreceptors and mechanorceptors. An internal stimulus is often the first component of a homeostatic control system. External stimuli are capable of producing systemic responses throughout the body, as in the fight-or-flight response. In order for a stimulus to be detected with high probability, its level must exceed the absolute threshold; if a signal does reach threshold, the information is transmitted to the central nervous system (CNS), where it is integrated and a decision on how to react is made. Although stimuli commonly cause the body to respond, it is the CNS that finally determines whether a signal causes a reaction or not.
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