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The Five Senses
Transcript of The Five Senses
*The main function of the sensory system is to receive stimuli to allow the body to react to changes. Vision is considered to be the most important sense because 90% of the information about a person's surroundings reaches the brain through the eyes.
The eye controls the special sense of vision. It receives stimuli and sends the impulses to the brain to be interpreted. After receiving light rays, the eye carries the information to the brain where it is translated into vision, or sight.
*Pathway of light through the eye
Cornea- Aqueous humor- Pupil- Lens -Vitreous humor The ear is the organ that controls this sense as well as the sense of balance. It receives stimuli and sends the impulses to the brain to be interpreted. After receiving sound waves, the ear carries the information to the brain where it is translated into hearing. The ear is divided into three main sections: the outer ear, middle ear, and inner ear.
The outer ear includes the pinna or auricle, auditory canal aka external auditory meatus.
The middle ear is a small chamber in the temporal bone that contain 3 small ossicles(bones). The throat and inner ear is connected with a tube called Eustachian which help equalize pressure in the ear.
The inner ear is the most complex, it contains the cochlea, corti, auditory nerve, three semicircular canals which contain liquid hair like cells that bend when liquid moves which kelp maintain balance. The nose is the organ that controls this sense. Olfactory receptors at the top of the nasal cavity make the sense of smell possible. They are nerve cells covered with tiny hairs called cilia. These cells receive stimuli from gases in the air. Then the impulses are carried by the olfactory nerve to the brain, where they are translated into smell. sense of smell is closely related to the sense of taste, although it is more sensitive than taste. General sense receptors are located throughout the body in the skin and connective tissue. Each receptor perceives only one type of feeling. For example, receptors in the skin that detect heat are distinct from those that detect cold. Messages from these receptors allow the body to respond to the environment and avoid possible harm. Taste is one of the five special senses. The tongue is the organ that controls this sense. It is a mass of muscle tissue that contains projections called papillae, which contain "taste buds." When food is moistened in fluid or saliva, taste buds are activated. The receptors in the taste buds send a signal to the brain to detect the flavor of the food.
The four basic tastes and their regions of the tongue are:
Sweet tastes at the tip.
Salty tastes near the tip.
Sour tastes at the sides.
Bitter tastes at the back.
The sense of smell also influences taste. 1. what is the main function
of the sensory system?
2. Why is vision considered to be the most important sense?
3. List the two major function of the ear.
4.What factor influences taste?
5.How does the skin react to different environmental factors depending on the receptor.? Answers.
1.to receive stimuli to allow the body to react to changes.
2.b/c 90% of the information about a person's surroundings reaches the brain through the eyes.
3.the ear controls the sence hearing and balance.
4.Sence of smell influences taste.
5.the skin receptors only one type of feeling meaning receptors in the skin that detect heat are distinct from those that detect cold. Diseases Eye
*Conjunctivitis is also called "pink eye" It is an inflammation of the eyelid caused by a bacteria or virus, and it is extremely infectious.
Symptoms include reddening of the eyelids and sclera. In addition, pus may form and lead to the closing of the eye. Treatment involves antibiotics.
*Cataract is a condition where the lens of the eye gradually becomes cloudy, which causes blurred or partial vision. The cause is not known. If left untreated, cataracts may lead to blindness. Treatment involves surgical replacement of the lens.
Hearing loss or deafness has two classifications, conductive or sensory.
*Conductive hearing loss occurs when sound waves are not carried to the inner ear. It is caused by a ruptured tympanic membrane or blockage in the ear, such as from wax, a foreign body, or an infection. Treatment involves removing the cause. Sensory hearing loss occurs when the inner ear or auditory nerve is damaged. Usually this type of hearing loss cannot be corrected.
*Otitis media is an infection of the middle ear caused by a bacteria or virus. It is common in young children and often follows a sore throat. Symptoms include pressure or pain in the ear and fever. If left untreated, otitus media may lead to hearing loss. Treatment involves antibiotics and possibly inserting tubes to relieve the pressure and fluid in the ear.
A cold is a respiratory infection. It may be caused by 1 of more than 200 viruses that are highly contagious. Symptoms may include sneezing, runny nose, sore throat, congestion, and cough. The symptoms typically last for one to two weeks. There is no cure for a cold. Treatment involves rest and medications to relieve symptoms. http://www.neok12.com/php/watch.php?v=zX454b044056425d65066e59&t=Sound http://videos.howstuffworks.com/tlc/29845-understanding-sense-of-touch-video.htm Bibliography page *Curriculum Viewer