BSF Chapter 9: The Senses-NOT FINISHED
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21 terms
Terms | Definitions |
|---|---|
 CLASSIFICATIONS OF THE SENSE ORGANS | General sense organs Special sense organs |
| GENERAL SENSE ORGANS | Widely distributed throughout the body in skin, muscles, tendons, joints and internal organs. Responsible for sense of pain, temperature, touch, pressure |
| SPECIAL SENSE ORGANS | Grouping of specialized receptors. Responsible for smell, taste, vision, hearing, equilibrium |
| ENCAPSULATED | Covered |
| UNENCAPSULATED | Free or naked |
| PHOTORECEPTORS | Light (eyes) |
| CHEMORECEPTORS | Chemicals (nose & mouth) |
| PAIN RECEPTORS | Injury |
| NOCICEPTORS | Injury to body; generally located in muscles |
| THERMORECEPTORS | Hot & cold - deeper layers of the skin |
| MECHANORECEPTORS | Movement or deforming of capsule - hearing |
| PROPRIOCEPTORS | Position of body parts or changes in muscle length or tension - exercising found in deep skeletal muscles |
| FUNCTIONAL CHARACTERISTICS OF SENSE ORGANS | Are able to detect a particular stimulus; stimulus converted into a nerve impulse; impulse perceived as a sensation in the CNS |
| TYPES OF RECEPTORS | Krause's end-bulbs - tough Golgi tendon receptors - muscle tensing - joints & muscles Muscle spindles- muscle lengthening - skeletal muscles detecting movement of that muscle |
| SCLERA | Tough outer coat; "white" of eye |
| CORNEA | Transparent part (window) of the sclera over the iris |
| CHOROID | Middle layer of the eye that contains a pigmented vascular layer to prevent scattering of light |
| IRIS | The colored part of the eye seen thru cornea |
| PUPIL | Black center of iris |
| SPOKE LIKE FIBERS | Contract - pupil dilates letting in more light (pupil dilates in dim light) |
| CIRCULAR FIBERS | Pupil constricts letting in fewer light (pupil constricts in bright light) |
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