Chap16_2401 - 1 SENSORY, MOTOR, AND INTEGRATIVE SYSTEMS...

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1 SENSORY, MOTOR, AND INTEGRATIVE SYSTEMS Chapter 16 Anatomy and Physiology Lecture
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2 SENSORY, MOTOR, AND INTEGRATIVE SYSTEMS (To survive very well on your own, one would be able to " sense " his/her environment and make necessary homeostatic adjustments.) (At any given time, our brain receives and responds to many varieties of information. However, we are aware only of the information that we consciously focus upon.) (The Central Nervous System selects only those bits of information that are important for the moment, and it is only those bits of information that are brought to our conscious level .) (There is no question that we would collapse into nervous wrecks if our consciousness were forced to deal with all the information arriving at once.) (The conscious mind is turned off to protect itself from over stimulation.) (A lack of sight would increase the risk of injury from unseen obstacles: - A loss of smell would allow a harmful gas to be inhaled; -A loss of hearing would prevent recognition of automobile horns; and -A lack of taste would allow toxic substances to be ingested.) SENSATION Senses – Are the means by which the brain receives information about the environment and the body. General senses – Are those with receptors distributed over a large part of the body.
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3 Two Groups of General Sense : 1. Somatic Senses – Provide sensory information about the body and the environment, include touch, pressure, temperature, proprioception, and pain. 2. Visceral Senses – Provide information about various internal organs, consist primarily of pain and pressure. Special Senses – Are more specialized in structure and are localized to specific parts of the body. Are smell, taste, sight, hearing, and balance. Sensation or Perception – Is the conscious awareness of stimuli received by sensory receptors. SENSORY RECEPTORS Types of Sensory Receptors A. Classification Based on the Type of Stimuli Mechanoreceptors – Respond mechanical stimuli, such as compression, bending, or stretching of cells. Touch, pressure, vibration, proprioception, hearing, equilibrium, blood pressure Chemoreceptors – Respond to chemicals that become attached to receptors on their membranes. Smell and taste depend on chemoreceptors. Thermoreceptors – Respond to changes in temperature at the site of the receptor and are necessary for the sense of temperature.
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4 Photoreceptors – Respond to light striking the receptor cells and are necessary for vision. Nociceptors or Pain Receptors
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This note was uploaded on 03/10/2012 for the course BIOL 2403 taught by Professor Campbell during the Spring '12 term at Texas Pan American.

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Chap16_2401 - 1 SENSORY, MOTOR, AND INTEGRATIVE SYSTEMS...

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