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Bio Notes - Goals for Chapter 29 Senses By the end of this...

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Goals for Chapter 29 – Senses By the end of this chapter, you should be able to: 29.1 Define and compare sensations and perceptions, noting where each is formed. - Sensations: action potentials received from sense receptors, brain interprets them to produce a perception - Perception: such as colors, smells, sounds, and tastes, are constructed by the brain as it processes sensations and integrates them with other info forming a meaningful interpretation or conscious understanding of sensory data. 29.2 Know how a sensory receptor cells functions using sensory transduction, receptor potential, and neurotransmitters. Understand how sensory receptor cells adapt after overstimulation. - Sensory receptor cells functions using sensory transduction by: converting the onye type of signal to an electrical signal, which produces a change in the membrane potential of the receptor cell. This change in the membrane potential is a result of the opening or closing of ion channels in the sensory receptor’s plasma membrane. - Changes in the flow of ions create a graded change in membrane potential called a receptor potential. Receptor potentials vary; the stronger the stimulus, the larger the receptor potential. - Neurotransmitters: The stronger the stimulus, triggers a strong receptor potential causing the receptor cell to release more neurotransmitter. This additional neurotransmitter increases the rate of action potential generation in the sensory neuron. - Sensory receptor cells adapt after overstimulation by becoming less sensitive which triggers fewer action potentials, and the brain may lose its awareness of stimuli. Sensory adaptation keeps the body from reacting to normal background stimuli. 29.3 Describe the five general categories of sensory receptors. Note examples of each and where they are found in the human body. Five general categories of sensory receptors - Pain Receptors: All animals probably have pain receptors, pain often indicates danger and usually make an animal withdraw to safety. All parts of the human body have pain receptors except the brain. Pain makes us aware of injury or disease. Pain receptors may response to excess heat or pressure or to chemicals released from damaged or inflamed tissues. - Thermoreceptors: detect either heat or cold. Other temperature sensors in the body monitor the temp. of blood. The hypothalamus is the body’s main thermostat. -
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This note was uploaded on 04/17/2008 for the course BIO 152 taught by Professor Grandy/holloway during the Spring '08 term at MCPHS.

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Bio Notes - Goals for Chapter 29 Senses By the end of this...

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