Part 1

Senses Vocabulary Identify the correct term for each definition. The ability of the brain to become less responsive to a maintained stimulus sensory adaptation Receptors detect an odor, stimulate neurons in the olfactory bulb to send a message to the brain to interpret the smell olfaction Visceral pain that feels as if it is coming from somewhere else referred pain Touch, pressure, temperature, pain general senses Smell, taste, vision, hearing, balance special senses Occurs when receptors are stimulated and send impulses to the brain sensation A conscious awareness of stimuli perception Brain sends a signal back to the point of origin so a person can detect the area being stimulated projection Receptors on taste cells detect a liquid taste and send an impulse to the brain to interpret that taste gustation ID the Sensory Receptor Match each activity you might do every day with the sensory receptors involved in that activity. Starting to sweat from the hot sun at the beach Thermoreceptors Drinking sour milk from the carton Chemoreceptors Dancing to your favorite song Proprioceptors (Mechanoreceptors) Hitting your thumb with a hammer Nociceptors Your neighbor taps your arm to get your attention Baroreceptors (Mechanoreceptors) Wearing glasses to read a book Photoreceptors Use the drop down word bank to match the pain receptor to its correct description. 1. nociceptors are pain receptors which communicate with the neurotransmitters Substance P and Glutamate.2. Taste buds contain gustatory receptors which respond to one of the 5 primary taste sensations.3. Receptors found in the eye which respond to light are photoreceptors4. Dendrites in epithelial tissues associated with itching are free nerve endings5. Mechanoreceptors which are made of flattened connective tissue sheaths and abundant in hairless areas to detect sensitive touch and motion are tactile (Meissner's) corpuscles6. Receptors associated with muscle contraction and tendon stretching are proprioceptors7. cold thermoreceptors respond to temperatures between 10-20 ℃ .8. Your sense of smell relies on olfactory receptors to detect food and chemical odors in the air.9. Receptors which respond to chemicals in taste and smell and in internal changes are chemoreceptors10. Pain receptors located in the organs which detect pain, spasms or stretch are the visceral pain receptors11. Mechanoreceptors which are large structures of connective tissue fibers and cells and can detect pressure deep in the dermis and hypodermis are lamellated (Pacinian) corpuscles12. warm thermoreceptors respond to temperatures between 25-45 ℃.13. Mechanoreceptors which respond to changes in blood pressure are called baroreceptors Use the drop down word bank to complete the following paragraph on olfaction. Olfactory receptor cells are modified neurons supported by ciliated columnar epithelial cells.They are a type of chemoreceptor used to detect smell. When olfactory receptors are stimulated, neurons in the olfactory bulb send an impulse to the brain along the olfactory nerve (pathway is called the olfactory tract). These impulses are received in the temporal and frontal lobes of the cerebrum for processing and interpretation. Some impulses proceed to the limbic system, which provides an emotional response to certain odors and to the hypothalamus to be stored as memories. Label the diagram of the tongue. USE THE NUMBER ONLY!1 - nerve fibers2 - stratified squamous epithelium3 - taste buds4 - gustatory cell 5 - taste hair 3 2 4 5 1 Use the drop down word bank to complete the following paragraph on gustation. Taste buds are the organs of taste. They are composed of modified epithelial cells that function as chemoreceptors. Each taste bud contains 50-100 taste cells which are also called gustatory cells. There are 5 main types of sensory cells each detecting a unique taste sensation – sweet, sour, salty, bitter, and umami (savory). Gustatory cells contain microvilli or "taste hairs" which protrude from openings called taste pores. Chemicals must be dissolved in salivato bind to the receptors on the taste cell. This stimulates neurons in the tongue to release neurotransmitters and send an impulse via the facial, vagus and glossopharyngeal nerves to the thalamus. Impulses are then routed to the gustatory complex located in the parietal lobe of the cerebrum for interpretation.